gpu: Add IOSurface backed GpuMemoryBuffer implementation.

content/common/child_process_host_impl.cc

Index: content/common/child_process_host_impl.cc
diff --git a/content/common/child_process_host_impl.cc b/content/common/child_process_host_impl.cc
index a2f40d4d7b37704c742b6ee725a8aad2aa53776f..1467536ac91131404381ba8f1b1d177c564e4de8 100644
--- a/content/common/child_process_host_impl.cc
+++ b/content/common/child_process_host_impl.cc
@@ -17,6 +17,7 @@
 #include "base/strings/stringprintf.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "content/common/child_process_messages.h"
+#include "content/common/gpu/client/gpu_memory_buffer_impl.h"
 #include "content/public/common/child_process_host_delegate.h"
 #include "content/public/common/content_paths.h"
 #include "content/public/common/content_switches.h"
@@ -296,10 +297,15 @@ void ChildProcessHostImpl::OnShutdownRequest() {
 }
 
 void ChildProcessHostImpl::OnAllocateGpuMemoryBuffer(
-    uint32 buffer_size,
+    uint32 width,
+    uint32 height,
+    uint32 internalformat,
     gfx::GpuMemoryBufferHandle* handle) {
   handle->type = gfx::SHARED_MEMORY_BUFFER;
-  AllocateSharedMemory(buffer_size, peer_handle_, &handle->handle);
+  AllocateSharedMemory(
+      width * height * GpuMemoryBufferImpl::BytesPerPixel(internalformat),
+      peer_handle_,
+      &handle->handle);
 }
 
 }  // namespace content