Plumb GpuMemoryBuffer allocation to GPU process.

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 9e320e0a6d77452a0bd855ca1bfcc937d73b0b2e..6234477a198e319e1b9dcd96aafdd1feb36e143b 100644
--- a/content/common/gpu/gpu_messages.h
+++ b/content/common/gpu/gpu_messages.h
@@ -282,6 +282,19 @@ IPC_MESSAGE_CONTROL3(GpuMsg_DeleteImage,
                      int32, /* image_id */
                      int32 /* sync_point */)
 
+// Allocate a buffer asynchronously in the GPU process.

[reveman, 2014/06/02 22:47:33]

How about "Tells the GPU process to create a new gpu memory buffer for |handle|"
as this will not allocate anything in the case when it's used as a replacement
for CreateImage.

+IPC_MESSAGE_CONTROL5(GpuMsg_CreateGpuMemoryBuffer,
+                     size_t,   /* width */
+                     size_t,   /* height */
+                     unsigned, /* internalformat */
+                     unsigned, /* usage */
+                     gfx::GpuMemoryBufferHandle /* handle */)
+
+// Tells the GPU process to delete buffer.
+IPC_MESSAGE_CONTROL2(GpuMsg_DeleteGpuMemoryBuffer,
+                     gfx::GpuMemoryBufferHandle, /* handle */
+                     int32 /* sync_point */)
+
 // Tells the GPU process to create a context for collecting graphics card
 // information.
 IPC_MESSAGE_CONTROL0(GpuMsg_CollectGraphicsInfo)
@@ -368,6 +381,10 @@ IPC_MESSAGE_CONTROL1(GpuHostMsg_DestroyCommandBuffer,
 IPC_MESSAGE_CONTROL1(GpuHostMsg_ImageCreated,
                      gfx::Size /* size */)
 
+// Response from GPU to a GpuMsg_CreateGpuMemoryBuffer message.
+IPC_MESSAGE_CONTROL1(GpuHostMsg_GpuMemoryBufferCreated,
+                     gfx::GpuMemoryBufferHandle /* handle */)
+
 // Response from GPU to a GpuMsg_CollectGraphicsInfo.
 IPC_MESSAGE_CONTROL1(GpuHostMsg_GraphicsInfoCollected,
                      gpu::GPUInfo /* GPU logging stats */)