Plumb a Browser->GPU surface destruction message for Android VDAs

content/common/gpu_host_messages.h

Index: content/common/gpu_host_messages.h
diff --git a/content/common/gpu_host_messages.h b/content/common/gpu_host_messages.h
index 0705be089559c4d4ff9cdd15650d3e92b9fbcdbd..dc5d81dfc25fd11a9f5da868a0545101aacabca3 100644
--- a/content/common/gpu_host_messages.h
+++ b/content/common/gpu_host_messages.h
@@ -196,6 +196,8 @@ IPC_MESSAGE_CONTROL1(AcceleratedSurfaceMsg_BufferPresented,
 #if defined(OS_ANDROID)
 // Tells the GPU process to wake up the GPU because we're about to draw.
 IPC_MESSAGE_CONTROL0(GpuMsg_WakeUpGpu)

[no sievers, 2016/04/19 23:30:17]

nit: newline

[watk, 2016/04/22 02:48:55]

Done.

+// Tells the GPU process to release the surface because it's being destroyed.
+IPC_MESSAGE_CONTROL1(GpuMsg_DestroyingVideoSurface, int /* surface_id */)
 #endif
 
 // Tells the GPU process to remove all contexts.
@@ -268,6 +270,13 @@ IPC_MESSAGE_CONTROL2(GpuHostMsg_AcceleratedSurfaceCreatedChildWindow,
                      gpu::SurfaceHandle /* child_window */)
 #endif
 
+#if defined(OS_ANDROID)
+// Reponse to a GpuMsg_DestroyingVideoSurface message.
+IPC_MESSAGE_CONTROL1(GpuHostMsg_DestroyingVideoSurfaceHandled,

[no sievers, 2016/04/19 23:30:17]

nit: how about DestroyingVideoSurfaceAck? We use that naming in other places for
simple replies.

[watk, 2016/04/22 02:48:55]

Done.

+                     int /* surface_id */)
+#endif
+
+
 IPC_MESSAGE_CONTROL1(GpuHostMsg_DidCreateOffscreenContext, GURL /* url */)
 
 IPC_MESSAGE_CONTROL3(GpuHostMsg_DidLoseContext,