[Android WebView] Pass .pak fds & regions to child services

Retrieving fds & regions from ResourceBundle and passing them as
additional mapped files.

BUG=522205

Review URL: https://codereview.chromium.org/1306323002

Cr-Commit-Position: refs/heads/master@{#345075}

android_webview/android_webview.gyp

@@ -327,6 +327,7 @@
         'common/android_webview_message_generator.h',
         'common/aw_content_client.cc',
         'common/aw_content_client.h',
+        'common/aw_descriptors.h',
         'common/aw_hit_test_data.cc',
         'common/aw_hit_test_data.h',
         'common/aw_message_port_messages.h',

android_webview/browser/aw_content_browser_client.cc

@@ -17,6 +17,7 @@
 #include "android_webview/browser/net/aw_url_request_context_getter.h"
 #include "android_webview/browser/net_disk_cache_remover.h"
 #include "android_webview/browser/renderer_host/aw_resource_dispatcher_host_delegate.h"
+#include "android_webview/common/aw_descriptors.h"
 #include "android_webview/common/render_view_messages.h"
 #include "android_webview/common/url_constants.h"
 #include "base/android/locale_utils.h"
@@ -37,6 +38,7 @@
 #include "net/ssl/ssl_cert_request_info.h"
 #include "net/ssl/ssl_info.h"
 #include "ui/base/resource/resource_bundle.h"
+#include "ui/base/resource/resource_bundle_android.h"
 #include "ui/resources/grit/ui_resources.h"
 
 using content::ResourceType;
@@ -453,6 +455,19 @@ bool AwContentBrowserClient::AllowPepperSocketAPI(
   return false;
 }
 
+void AwContentBrowserClient::GetAdditionalMappedFilesForChildProcess(
+      const base::CommandLine& command_line,
+      int child_process_id,
+      content::FileDescriptorInfo* mappings,
+      std::map<int, base::MemoryMappedFile::Region>* regions) {
+  int fd = ui::GetMainAndroidPackFd(
+      &(*regions)[kAndroidWebViewMainPakDescriptor]);
+  mappings->Share(kAndroidWebViewMainPakDescriptor, fd);
+
+  fd = ui::GetLocalePackFd(&(*regions)[kAndroidWebViewLocalePakDescriptor]);
+  mappings->Share(kAndroidWebViewLocalePakDescriptor, fd);
+}
+
 void AwContentBrowserClient::OverrideWebkitPrefs(
     content::RenderViewHost* rvh,
     content::WebPreferences* web_prefs) {

android_webview/browser/aw_content_browser_client.h

@@ -135,6 +135,11 @@ class AwContentBrowserClient : public content::ContentBrowserClient {
       const GURL& url,
       bool private_api,
       const content::SocketPermissionRequest* params) override;
+  void GetAdditionalMappedFilesForChildProcess(
+      const base::CommandLine& command_line,
+      int child_process_id,
+      content::FileDescriptorInfo* mappings,
+      std::map<int, base::MemoryMappedFile::Region>* regions) override;
   void OverrideWebkitPrefs(content::RenderViewHost* rvh,
                            content::WebPreferences* web_prefs) override;
 #if defined(VIDEO_HOLE)

android_webview/common/aw_descriptors.h

@@ -0,0 +1,15 @@
+// Copyright 2015 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.
+
+#ifndef ANDROID_WEBVIEW_COMMON_AW_DESCRIPTORS_H_
+#define ANDROID_WEBVIEW_COMMON_AW_DESCRIPTORS_H_
+
+#include "content/public/common/content_descriptors.h"
+
+enum {
+  kAndroidWebViewLocalePakDescriptor = kContentIPCDescriptorMax + 1,
+  kAndroidWebViewMainPakDescriptor,
+};
+
+#endif  // ANDROID_WEBVIEW_COMMON_AW_DESCRIPTORS_H_

android_webview/lib/main/aw_main_delegate.cc

@@ -7,6 +7,7 @@
 #include "android_webview/browser/aw_content_browser_client.h"
 #include "android_webview/browser/browser_view_renderer.h"
 #include "android_webview/browser/scoped_allow_wait_for_legacy_web_view_api.h"
+#include "android_webview/common/aw_descriptors.h"
 #include "android_webview/common/aw_switches.h"
 #include "android_webview/crash_reporter/aw_microdump_crash_reporter.h"
 #include "android_webview/lib/aw_browser_dependency_factory_impl.h"
@@ -36,6 +37,7 @@
 #include "gpu/command_buffer/client/gl_in_process_context.h"
 #include "gpu/command_buffer/service/gpu_switches.h"
 #include "media/base/media_switches.h"
+#include "ui/base/resource/resource_bundle.h"
 #include "ui/events/gesture_detection/gesture_configuration.h"
 
 namespace android_webview {
@@ -138,14 +140,30 @@ bool AwMainDelegate::BasicStartupComplete(int* exit_code) {
 }
 
 void AwMainDelegate::PreSandboxStartup() {
-  // TODO(torne): When we have a separate renderer process, we need to handle
-  // being passed open FDs for the resource paks here.
 #if defined(ARCH_CPU_ARM_FAMILY)
   // Create an instance of the CPU class to parse /proc/cpuinfo and cache
   // cpu_brand info.
   base::CPU cpu_info;
 #endif
 
+  const base::CommandLine& command_line =
+      *base::CommandLine::ForCurrentProcess();
+  std::string process_type =
+      command_line.GetSwitchValueASCII(switches::kProcessType);
+  if (process_type == switches::kRendererProcess) {
+    auto global_descriptors = base::GlobalDescriptors::GetInstance();
+    int pak_fd = global_descriptors->Get(kAndroidWebViewLocalePakDescriptor);
+    base::MemoryMappedFile::Region pak_region =
+        global_descriptors->GetRegion(kAndroidWebViewLocalePakDescriptor);
+    ResourceBundle::InitSharedInstanceWithPakFileRegion(base::File(pak_fd),
+                                                        pak_region);
+    pak_fd = global_descriptors->Get(kAndroidWebViewMainPakDescriptor);
+    pak_region =
+        global_descriptors->GetRegion(kAndroidWebViewMainPakDescriptor);
+    ResourceBundle::GetSharedInstance().AddDataPackFromFileRegion(
+        base::File(pak_fd), pak_region, ui::SCALE_FACTOR_NONE);
+  }
+
   crash_reporter::EnableMicrodumpCrashReporter();
 }