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 f7d66eaf458bc13dba047faa28ae7cccdd235ace..c446d9de40ae33075f09d8db2798a3efde29d4c3 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -1071,15 +1071,13 @@ scoped_ptr<gfx::GpuMemoryBuffer> RenderThreadImpl::AllocateGpuMemoryBuffer(
   if (!GpuMemoryBufferImpl::IsFormatValid(internalformat))
     return scoped_ptr<gfx::GpuMemoryBuffer>();
 
-  size_t size = width * height *
-      GpuMemoryBufferImpl::BytesPerPixel(internalformat);
-  if (size > static_cast<size_t>(std::numeric_limits<int>::max()))
-    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())
@@ -1090,19 +1088,10 @@ 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() {