Send notification from GPU process to browser process of offscreen context creation and destruction…

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 11278f310810175509c3a3ed02a998a51f4877d1..3f3cf674682851ad7f78bceec0cef23e96076e61 100644
--- a/content/common/gpu/gpu_messages.h
+++ b/content/common/gpu/gpu_messages.h
@@ -400,6 +400,17 @@ IPC_MESSAGE_CONTROL3(GpuHostMsg_UpdateVSyncParameters,
                      base::TimeTicks /* timebase */,
                      base::TimeDelta /* interval */)
 
+IPC_MESSAGE_CONTROL1(GpuHostMsg_DidCreateOffscreenContext,
+                     GURL /* url */)
+
+IPC_MESSAGE_CONTROL3(GpuHostMsg_DidLoseContext,
+                     bool /* offscreen */,
+                     gpu::error::ContextLostReason /* reason */,
+                     GURL /* url */)
+
+IPC_MESSAGE_CONTROL1(GpuHostMsg_DidDestroyOffscreenContext,
+                     GURL /* url */)
+
 //------------------------------------------------------------------------------
 // GPU Channel Messages
 // These are messages from a renderer process to the GPU process.