Add GPU memory tab to the task manager.

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 2415fa8661e3c31b2b7345b16c2643727e948519..6853e341b8ad5eb26e661f2aac79f4d4297e4bc2 100644
--- a/content/common/gpu/gpu_messages.h
+++ b/content/common/gpu/gpu_messages.h
@@ -162,6 +162,15 @@ IPC_STRUCT_TRAITS_BEGIN(content::GPUInfo)
 #endif
 IPC_STRUCT_TRAITS_END()
 
+IPC_STRUCT_TRAITS_BEGIN(content::GPUVidmem::GPUProcessVidmem)
+  IPC_STRUCT_TRAITS_MEMBER(vidmem)
+  IPC_STRUCT_TRAITS_MEMBER(has_duplicates)
+IPC_STRUCT_TRAITS_END()
+
+IPC_STRUCT_TRAITS_BEGIN(content::GPUVidmem)
+  IPC_STRUCT_TRAITS_MEMBER(process_map)
+IPC_STRUCT_TRAITS_END()
+
 IPC_STRUCT_TRAITS_BEGIN(GpuMemoryAllocationForRenderer)
   IPC_STRUCT_TRAITS_MEMBER(gpu_resource_size_in_bytes)
   IPC_STRUCT_TRAITS_MEMBER(suggest_have_backbuffer)
@@ -221,6 +230,9 @@ IPC_MESSAGE_CONTROL4(GpuMsg_CreateViewCommandBuffer,
 // information.
 IPC_MESSAGE_CONTROL0(GpuMsg_CollectGraphicsInfo)
 
+// Tells the GPU process to report vidmem information for the task manager
+IPC_MESSAGE_CONTROL0(GpuMsg_GetVidmem);
+
 // Tells the GPU process that the browser process has finished resizing the
 // view.
 IPC_MESSAGE_ROUTED0(AcceleratedSurfaceMsg_ResizeViewACK)
@@ -282,6 +294,10 @@ IPC_MESSAGE_CONTROL1(GpuHostMsg_DestroyCommandBuffer,
 IPC_MESSAGE_CONTROL1(GpuHostMsg_GraphicsInfoCollected,
                      content::GPUInfo /* GPU logging stats */)
 
+// Response from GPU to a GpuMsg_GetVidmem.
+IPC_MESSAGE_CONTROL1(GpuHostMsg_Vidmem,
+                     content::GPUVidmem /* GPU memory usage stats */)
+
 // Message from GPU to add a GPU log message to the about:gpu page.
 IPC_MESSAGE_CONTROL3(GpuHostMsg_OnLogMessage,
                      int /*severity*/,