aw: Use ipc command buffer by default

BUG=509702

Review URL: https://codereview.chromium.org/1249313005

Cr-Commit-Position: refs/heads/master@{#341125}

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_switches.h"
 #include "android_webview/crash_reporter/aw_microdump_crash_reporter.h"
 #include "android_webview/lib/aw_browser_dependency_factory_impl.h"
 #include "android_webview/native/aw_media_url_interceptor.h"
@@ -60,6 +61,7 @@ bool AwMainDelegate::BasicStartupComplete(int* exit_code) {
   BrowserViewRenderer::CalculateTileMemoryPolicy();
 
   base::CommandLine* cl = base::CommandLine::ForCurrentProcess();
+  cl->AppendSwitch(switches::kUseIpcCommandBuffer);
   cl->AppendSwitch(cc::switches::kEnableBeginFrameScheduling);
 
   // WebView uses the Android system's scrollbars and overscroll glow.