Convert AwViewMsg_SetBackgroundColor to a mojom message.

There are a series of messages that are sent to the LocalMainFrame
of the webview. This maps SetBackgroundColor onto one of those messages.
Other targeted messages will be converted in followup CLs.

BUG=993189

Change-Id: I221d0c9be378c731d0bb3a11e508bda8ba0dc849
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2518798
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824926}

android_webview/browser/renderer_host/aw_render_view_host_ext.cc

@@ -16,6 +16,7 @@
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
+#include "third_party/blink/public/common/associated_interfaces/associated_interface_provider.h"
 
 namespace android_webview {
 
@@ -104,9 +105,8 @@ void AwRenderViewHostExt::SetBackgroundColor(SkColor c) {
   if (background_color_ == c)
     return;
   background_color_ = c;
-  if (web_contents()->GetRenderViewHost()) {
-    web_contents()->GetMainFrame()->Send(new AwViewMsg_SetBackgroundColor(
-        web_contents()->GetMainFrame()->GetRoutingID(), background_color_));
+  if (local_main_frame_remote_) {
+    local_main_frame_remote_->SetBackgroundColor(background_color_);
   }
 }
 
@@ -144,8 +144,11 @@ void AwRenderViewHostExt::ClearImageRequests() {
 void AwRenderViewHostExt::RenderFrameCreated(
     content::RenderFrameHost* frame_host) {
   if (!frame_host->GetParent()) {
-    frame_host->Send(new AwViewMsg_SetBackgroundColor(
-        frame_host->GetRoutingID(), background_color_));
+    local_main_frame_remote_.reset();
+    frame_host->GetRemoteAssociatedInterfaces()->GetInterface(
+        local_main_frame_remote_.BindNewEndpointAndPassReceiver());
+
+    local_main_frame_remote_->SetBackgroundColor(background_color_);
   }
 }
 

android_webview/browser/renderer_host/aw_render_view_host_ext.h

@@ -8,9 +8,11 @@
 #include "content/public/browser/web_contents_observer.h"
 
 #include "android_webview/common/aw_hit_test_data.h"
+#include "android_webview/common/mojom/frame.mojom.h"
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/sequence_checker.h"
+#include "mojo/public/cpp/bindings/associated_remote.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/geometry/point_f.h"
 #include "ui/gfx/geometry/size.h"
@@ -118,6 +120,9 @@ class AwRenderViewHostExt : public content::WebContentsObserver {
   // Some WebView users might want to show their own error pages / logic.
   bool will_suppress_error_page_ = false;
 
+  // Associated channel to the webview LocalMainFrame extensions.
+  mojo::AssociatedRemote<mojom::LocalMainFrame> local_main_frame_remote_;
+
   SEQUENCE_CHECKER(sequence_checker_);
 
   DISALLOW_COPY_AND_ASSIGN(AwRenderViewHostExt);

android_webview/common/BUILD.gn

@@ -64,7 +64,13 @@ mojom("mojom") {
   # We don't want Blink variants of bindings to be generated.
   disable_variants = true
 
-  sources = [ "mojom/renderer.mojom" ]
+  sources = [
+    "mojom/frame.mojom",
+    "mojom/renderer.mojom",
+  ]
 
-  public_deps = [ "//mojo/public/mojom/base" ]
+  public_deps = [
+    "//mojo/public/mojom/base",
+    "//skia/public/mojom",
+  ]
 }

android_webview/common/mojom/frame.mojom

@@ -0,0 +1,15 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+module android_webview.mojom;
+
+import "skia/public/mojom/skcolor.mojom";
+
+// Similar to blink::mojom::LocalMainFrame. This interface adds additional
+// things that webview needs from the main frame.
+interface LocalMainFrame {
+
+  // Sets the base background color for this view.
+  SetBackgroundColor(skia.mojom.SkColor color);
+};

android_webview/common/render_view_messages.h

@@ -71,10 +71,6 @@ IPC_MESSAGE_ROUTED0(AwViewMsg_ResetScrollAndScaleState)
 IPC_MESSAGE_ROUTED1(AwViewMsg_SetInitialPageScale,
                     double /* page_scale_factor */)
 
-// Sets the base background color for this view.
-IPC_MESSAGE_ROUTED1(AwViewMsg_SetBackgroundColor,
-                    SkColor)
-
 IPC_MESSAGE_CONTROL1(AwViewMsg_SetJsOnlineProperty,
                      bool /* network_up */)
 

android_webview/renderer/aw_render_frame_ext.cc

@@ -162,6 +162,12 @@ AwRenderFrameExt::AwRenderFrameExt(content::RenderFrame* render_frame)
   if (content_capture::features::IsContentCaptureEnabled())
     new content_capture::ContentCaptureSender(render_frame, &registry_);
 
+  // If we are the main frame register an additional mojo interface.
+  if (render_frame->IsMainFrame()) {
+    registry_.AddInterface(base::BindRepeating(
+        &AwRenderFrameExt::BindLocalMainFrame, base::Unretained(this)));
+  }
+
   // Add myself to the RenderFrame => AwRenderFrameExt register.
   GetFrameExtMap()->emplace(render_frame, this);
 }
@@ -228,7 +234,6 @@ bool AwRenderFrameExt::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(AwViewMsg_ResetScrollAndScaleState,
                         OnResetScrollAndScaleState)
     IPC_MESSAGE_HANDLER(AwViewMsg_SetInitialPageScale, OnSetInitialPageScale)
-    IPC_MESSAGE_HANDLER(AwViewMsg_SetBackgroundColor, OnSetBackgroundColor)
     IPC_MESSAGE_HANDLER(AwViewMsg_SmoothScroll, OnSmoothScroll)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
@@ -329,7 +334,7 @@ void AwRenderFrameExt::OnSetInitialPageScale(double page_scale_factor) {
   webview->SetInitialPageScaleOverride(page_scale_factor);
 }
 
-void AwRenderFrameExt::OnSetBackgroundColor(SkColor c) {
+void AwRenderFrameExt::SetBackgroundColor(SkColor c) {
   blink::WebView* webview = GetWebView();
   if (!webview)
     return;
@@ -365,4 +370,9 @@ void AwRenderFrameExt::OnDestruct() {
   delete this;
 }
 
+void AwRenderFrameExt::BindLocalMainFrame(
+    mojo::PendingAssociatedReceiver<mojom::LocalMainFrame> pending_receiver) {
+  local_main_frame_receiver_.Bind(std::move(pending_receiver));
+}
+
 }  // namespace android_webview

android_webview/renderer/aw_render_frame_ext.h

@@ -5,8 +5,11 @@
 #ifndef ANDROID_WEBVIEW_RENDERER_AW_RENDER_FRAME_EXT_H_
 #define ANDROID_WEBVIEW_RENDERER_AW_RENDER_FRAME_EXT_H_
 
+#include "android_webview/common/mojom/frame.mojom.h"
 #include "base/macros.h"
 #include "content/public/renderer/render_frame_observer.h"
+#include "mojo/public/cpp/bindings/associated_receiver.h"
+#include "mojo/public/cpp/bindings/pending_associated_receiver.h"
 #include "third_party/blink/public/common/associated_interfaces/associated_interface_registry.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/geometry/point_f.h"
@@ -24,7 +27,8 @@ namespace android_webview {
 // Render process side of AwRenderViewHostExt, this provides cross-process
 // implementation of miscellaneous WebView functions that we need to poke
 // WebKit directly to implement (and that aren't needed in the chrome app).
-class AwRenderFrameExt : public content::RenderFrameObserver {
+class AwRenderFrameExt : public content::RenderFrameObserver,
+                         mojom::LocalMainFrame {
  public:
   explicit AwRenderFrameExt(content::RenderFrame* render_frame);
 
@@ -53,16 +57,22 @@ class AwRenderFrameExt : public content::RenderFrameObserver {
 
   void OnSetInitialPageScale(double page_scale_factor);
 
-  void OnSetBackgroundColor(SkColor c);
-
   void OnSmoothScroll(int target_x, int target_y, base::TimeDelta duration);
 
+  // mojom::LocalMainFrame overrides:
+  void SetBackgroundColor(SkColor c) override;
+
+  void BindLocalMainFrame(
+      mojo::PendingAssociatedReceiver<mojom::LocalMainFrame> pending_receiver);
+
   blink::WebView* GetWebView();
   blink::WebFrameWidget* GetWebFrameWidget();
 
   url::Origin last_origin_;
 
   blink::AssociatedInterfaceRegistry registry_;
+  mojo::AssociatedReceiver<mojom::LocalMainFrame> local_main_frame_receiver_{
+      this};
 
   DISALLOW_COPY_AND_ASSIGN(AwRenderFrameExt);
 };