gpu: Add IOSurface backed GpuMemoryBuffer implementation.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 3f7ec1ec1cf019eeab7807396ec2cbc37c36048b..65ecb40bf5e6b6c9979a3ef3da59937896ab2b27 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -406,6 +406,10 @@ void RenderThreadImpl::Init() {
 
   renderer_process_id_ = base::kNullProcessId;
 
+  // AllocateGpuMemoryBuffer must be used exclusively on one thread but
+  // it doesn't have to be the same thread RenderThreadImpl is created on.
+  allocate_gpu_memory_buffer_thread_checker_.DetachFromThread();
+
   TRACE_EVENT_END_ETW("RenderThreadImpl::Init", 0, "");
 }
 
@@ -1070,18 +1074,18 @@ scoped_ptr<gfx::GpuMemoryBuffer> RenderThreadImpl::AllocateGpuMemoryBuffer(
     size_t width,
     size_t height,
     unsigned internalformat) {
-  if (!GpuMemoryBufferImpl::IsFormatValid(internalformat))
-    return scoped_ptr<gfx::GpuMemoryBuffer>();
+  DCHECK(allocate_gpu_memory_buffer_thread_checker_.CalledOnValidThread());
 
-  size_t size = width * height *
-      GpuMemoryBufferImpl::BytesPerPixel(internalformat);
-  if (size > static_cast<size_t>(std::numeric_limits<int>::max()))
+  if (!GpuMemoryBufferImpl::IsFormatValid(internalformat))
     return scoped_ptr<gfx::GpuMemoryBuffer>();
 
   gfx::GpuMemoryBufferHandle handle;
   bool success;
   IPC::Message* message =
-      new ChildProcessHostMsg_SyncAllocateGpuMemoryBuffer(size, &handle);
+      new ChildProcessHostMsg_SyncAllocateGpuMemoryBuffer(width,
+                                                          height,
+                                                          internalformat,
+                                                          &handle);
 
   // Allow calling this from the compositor thread.
   if (base::MessageLoop::current() == message_loop())
@@ -1092,19 +1096,10 @@ scoped_ptr<gfx::GpuMemoryBuffer> RenderThreadImpl::AllocateGpuMemoryBuffer(
   if (!success)
     return scoped_ptr<gfx::GpuMemoryBuffer>();
 
-  // Currently, shared memory is the only supported buffer type.
-  if (handle.type != gfx::SHARED_MEMORY_BUFFER)
-    return scoped_ptr<gfx::GpuMemoryBuffer>();
-
-  if (!base::SharedMemory::IsHandleValid(handle.handle))
-    return scoped_ptr<gfx::GpuMemoryBuffer>();
-
-  return make_scoped_ptr<gfx::GpuMemoryBuffer>(
-      new GpuMemoryBufferImpl(
-          make_scoped_ptr(new base::SharedMemory(handle.handle, false)),
-          width,
-          height,
-          internalformat));
+  return GpuMemoryBufferImpl::Create(
+      handle,
+      gfx::Size(width, height),
+      internalformat).PassAs<gfx::GpuMemoryBuffer>();
 }
 
 void RenderThreadImpl::DoNotSuspendWebKitSharedTimer() {