PyAuto test for GPU memory consumption

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 2a6ddafd2944858b90af984983babfa2b3be2215..b41fbb3186f8e962813a0c360b43ccddea37a29f 100644
--- a/content/common/gpu/gpu_messages.h
+++ b/content/common/gpu/gpu_messages.h
@@ -14,6 +14,7 @@
 #include "content/common/gpu/gpu_process_launch_causes.h"
 #include "content/public/common/common_param_traits.h"
 #include "content/public/common/gpu_info.h"
+#include "content/public/common/gpu_mem_stats.h"
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "gpu/command_buffer/common/constants.h"
 #include "gpu/ipc/gpu_command_buffer_traits.h"
@@ -133,6 +134,12 @@ IPC_STRUCT_TRAITS_BEGIN(content::GPUInfo)
 #endif
 IPC_STRUCT_TRAITS_END()
 
+IPC_STRUCT_TRAITS_BEGIN(content::GpuMemStats)
+  IPC_STRUCT_TRAITS_MEMBER(total_bytes)
+  IPC_STRUCT_TRAITS_MEMBER(currently_allocated_bytes)
+  IPC_STRUCT_TRAITS_MEMBER(max_concurrently_allocated_bytes)
+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)
@@ -192,6 +199,9 @@ IPC_MESSAGE_CONTROL4(GpuMsg_CreateViewCommandBuffer,
 // information.
 IPC_MESSAGE_CONTROL0(GpuMsg_CollectGraphicsInfo)
 
+// Tells the GPU process to report memory usage statistics to the browser
+IPC_MESSAGE_CONTROL0(GpuMsg_GetMemStats)
+
 // Tells the GPU process that the browser process has finished resizing the
 // view.
 IPC_MESSAGE_ROUTED0(AcceleratedSurfaceMsg_ResizeViewACK)
@@ -253,6 +263,10 @@ IPC_MESSAGE_CONTROL1(GpuHostMsg_DestroyCommandBuffer,
 IPC_MESSAGE_CONTROL1(GpuHostMsg_GraphicsInfoCollected,
                      content::GPUInfo /* GPU logging stats */)
 
+// Response from GPU to a GpuMsg_GetMemStats.
+IPC_MESSAGE_CONTROL1(GpuHostMsg_MemStats,
+                     content::GpuMemStats /* 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*/,