GLInProcessContext: support async flushes and dedicated GPU 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 4c94d1feaf17a78087a0ea62de6f2b061851e288..0e43adde6a76ed3b5d711c3b68b7b425cba09d50 100644
--- a/android_webview/lib/main/aw_main_delegate.cc
+++ b/android_webview/lib/main/aw_main_delegate.cc
@@ -22,6 +22,7 @@
 #include "content/public/browser/browser_thread.h"
 #include "content/public/common/content_switches.h"
 #include "gpu/command_buffer/client/gl_in_process_context.h"
+#include "gpu/command_buffer/service/in_process_command_buffer.h"
 #include "webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
 
 namespace android_webview {
@@ -45,9 +46,9 @@ AwMainDelegate::~AwMainDelegate() {
 bool AwMainDelegate::BasicStartupComplete(int* exit_code) {
   content::SetContentClient(&content_client_);
 
-  gpu::GLInProcessContext::EnableVirtualizedContext();
   gpu::GLInProcessContext::SetGpuMemoryBufferFactory(
       gpu_memory_buffer_factory_.get());
+  gpu::InProcessCommandBuffer::EnableVirtualizedContext();
 
   CommandLine* cl = CommandLine::ForCurrentProcess();
   cl->AppendSwitch(switches::kEnableBeginFrameScheduling);