ozone: gpu: Add plumbing for platform-specific gpu messaging

content/common/gpu/gpu_messages.h

Index: content/common/gpu/gpu_messages.h
diff --git a/content/common/gpu/gpu_messages.h b/content/common/gpu/gpu_messages.h
index bd7a5d6ce7f1c3433630aca041b99f9d77cc78e8..8a4621ac73eb606b55ceac29acdeb2bf10eda19c 100644
--- a/content/common/gpu/gpu_messages.h
+++ b/content/common/gpu/gpu_messages.h
@@ -323,6 +323,10 @@ IPC_MESSAGE_CONTROL0(GpuMsg_Hang)
 // Tells the GPU process to disable the watchdog thread.
 IPC_MESSAGE_CONTROL0(GpuMsg_DisableWatchdog)
 
+// Tells the browser to initialize GpuPlatformSupport.

[rjkroege, 2014/06/16 21:38:49]

isn't it telling the GPU process? 

[spang, 2014/06/17 14:47:34]

Yes - oops.

+IPC_MESSAGE_CONTROL1(GpuMsg_InitializePlatformSupport,
+                     int32 /* host_route_id */)
+
 //------------------------------------------------------------------------------
 // GPU Host Messages
 // These are messages to the browser.
@@ -403,6 +407,11 @@ IPC_MESSAGE_CONTROL2(GpuHostMsg_AcceleratedSurfaceInitialized,
                      int32 /* surface_id */,
                      int32 /* route_id */)
 
+// Tells the browser that GpuPlatformSupport was initialized.
+IPC_MESSAGE_CONTROL2(GpuHostMsg_PlatformSupportInitialized,
+                     int32 /* host_route_id */,
+                     int32 /* gpu_route_id */)
+
 // Tells the browser that a frame with the specific latency info was drawn to
 // the screen
 IPC_MESSAGE_CONTROL1(GpuHostMsg_FrameDrawn,