[NOT FOR COMMIT] Hacks to merge render compositor thread with UI thread

android_webview/lib/main/aw_main_delegate.cc

Index: android_webview/lib/main/aw_main_delegate.cc
diff --git a/android_webview/lib/main/aw_main_delegate.cc b/android_webview/lib/main/aw_main_delegate.cc
index 99a4b0d0e50c2945c98ef84b7a6f0e299c823f84..a27b0a5a8773e99224a355b845b13be4c8ea65f9 100644
--- a/android_webview/lib/main/aw_main_delegate.cc
+++ b/android_webview/lib/main/aw_main_delegate.cc
@@ -33,6 +33,9 @@ bool AwMainDelegate::BasicStartupComplete(int* exit_code) {
   // Set the command line to enable synchronous API compatibility.
   command_line->AppendSwitch(switches::kEnableWebViewSynchronousAPIs);
 
+  // Merge browser UI and renderer compositor threads.
+  command_line->AppendSwitch(switches::kMergeUIAndRendererCompositorThreads);
+
   return false;
 }