Change glimage to accept a type.

content/common/gpu/client/gpu_memory_buffer_impl.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/common/gpu/client/gpu_memory_buffer_impl.h"
 
 #include "ui/gl/gl_bindings.h"
 
 namespace content {
 
@@ skipping 10 matching lines @@
   switch (internalformat) {
     case GL_BGRA8_EXT:
     case GL_RGBA8_OES:
       return true;
     default:
       return false;
   }
 }
 
 // static
+bool GpuMemoryBufferImpl::IsUsageValid(unsigned usage) {
+  switch (usage) {
+    case GL_IMAGE_MAP_CHROMIUM:

[reveman, 2014/05/01 15:15:55]

Please include SCANOUT here.

Each specific implementation should have a static IsUsageSupported function that
prevents allocation of buffers with unsupported usage mode.

+      return true;
+    default:
+      return false;
+  }
+}
+
+// static
 size_t GpuMemoryBufferImpl::BytesPerPixel(unsigned internalformat) {
   switch (internalformat) {
     case GL_BGRA8_EXT:
     case GL_RGBA8_OES:
       return 4;
     default:
       NOTREACHED();
       return 0;
   }
 }
 
 bool GpuMemoryBufferImpl::IsMapped() const { return mapped_; }
 
 uint32 GpuMemoryBufferImpl::GetStride() const {
   return size_.width() * BytesPerPixel(internalformat_);
 }
 
 }  // namespace content