Add a JS API for detecting WebGL availability.

content/browser/gpu/gpu_process_host.cc

Index: content/browser/gpu/gpu_process_host.cc
===================================================================
--- content/browser/gpu/gpu_process_host.cc	(revision 112998)
+++ content/browser/gpu/gpu_process_host.cc	(working copy)
@@ -373,8 +373,6 @@
     IPC_MESSAGE_HANDLER(GpuHostMsg_ChannelEstablished, OnChannelEstablished)
     IPC_MESSAGE_HANDLER(GpuHostMsg_CommandBufferCreated, OnCommandBufferCreated)
     IPC_MESSAGE_HANDLER(GpuHostMsg_DestroyCommandBuffer, OnDestroyCommandBuffer)
-    IPC_MESSAGE_HANDLER(GpuHostMsg_GraphicsInfoCollected,
-                        OnGraphicsInfoCollected)
     IPC_MESSAGE_UNHANDLED(RouteOnUIThread(message))
   IPC_END_MESSAGE_MAP()
 
@@ -502,14 +500,6 @@
 #endif  // defined(TOOLKIT_USES_GTK)
 }
 
-void GpuProcessHost::OnGraphicsInfoCollected(const content::GPUInfo& gpu_info) {
-  // OnGraphicsInfoCollected is sent back after the GPU process successfully
-  // initializes GL.
-  TRACE_EVENT0("test_gpu", "OnGraphicsInfoCollected");
-
-  GpuDataManager::GetInstance()->UpdateGpuInfo(gpu_info);
-}
-
 void GpuProcessHost::OnProcessLaunched() {
   // Send the GPU process handle to the UI thread before it has to
   // respond to any requests to establish a GPU channel. The response