{Browser}GpuMemoryBufferManager: add supported native attrib queries

content/browser/gpu/browser_gpu_memory_buffer_manager.h

Index: content/browser/gpu/browser_gpu_memory_buffer_manager.h
diff --git a/content/browser/gpu/browser_gpu_memory_buffer_manager.h b/content/browser/gpu/browser_gpu_memory_buffer_manager.h
index a6468d77b827a368a8f732b84c6e4b0425ea0dd0..417c7317c4bcaec8fcc03ce52fadec469150802b 100644
--- a/content/browser/gpu/browser_gpu_memory_buffer_manager.h
+++ b/content/browser/gpu/browser_gpu_memory_buffer_manager.h
@@ -32,6 +32,9 @@ class CONTENT_EXPORT BrowserGpuMemoryBufferManager
       base::Callback<void(const gfx::GpuMemoryBufferHandle& handle)>;
   using AllocationCallback = CreateCallback;
 
+  using GetGpuMemoryBufferAttribsCallback = base::Callback<void(
+      const gfx::GpuMemoryBufferAttribVector& supported_attribs)>;
+
   BrowserGpuMemoryBufferManager(int gpu_client_id,
                                 uint64_t gpu_client_tracing_id);
   ~BrowserGpuMemoryBufferManager() override;
@@ -47,6 +50,7 @@ class CONTENT_EXPORT BrowserGpuMemoryBufferManager
   void SetDestructionSyncToken(gfx::GpuMemoryBuffer* buffer,
                                const gpu::SyncToken& sync_token) override;
 
+  gfx::GpuMemoryBufferAttribVector GetGpuMemoryBufferAttribs() override;
   // Overridden from base::trace_event::MemoryDumpProvider:
   bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
                     base::trace_event::ProcessMemoryDump* pmd) override;
@@ -87,12 +91,28 @@ class CONTENT_EXPORT BrowserGpuMemoryBufferManager
 
   struct CreateGpuMemoryBufferRequest;
 
+  struct GetGpuMemoryBufferAttribsRequest;
+
   std::unique_ptr<gfx::GpuMemoryBuffer> AllocateGpuMemoryBufferForSurface(
       const gfx::Size& size,
       gfx::BufferFormat format,
       gfx::BufferUsage usage,
       gpu::SurfaceHandle surface_handle);
 
+  using GetGpuMemoryBufferAttribsDelegate =
+      base::Callback<void(GpuProcessHost* host,
+                          int client_id,
+                          const GetGpuMemoryBufferAttribsCallback& callback)>;
+  void HandleGetGpuMemoryBufferAttribsOnIO(
+      GetGpuMemoryBufferAttribsRequest* request);
+  void GetGpuMemoryBufferAttribsOnIO(
+      const GetGpuMemoryBufferAttribsDelegate& delegate,
+      int client_id,
+      const GetGpuMemoryBufferAttribsCallback& callback);
+  void HandleGpuMemoryBufferAttribsReceivedOnIO(
+      GetGpuMemoryBufferAttribsRequest* request,
+      const gfx::GpuMemoryBufferAttribVector& supported_attribs);
+
   // Functions that handle synchronous buffer creation requests.
   void HandleCreateGpuMemoryBufferOnIO(CreateGpuMemoryBufferRequest* request);
   void HandleGpuMemoryBufferCreatedOnIO(