gpu: Add YCbCr 420v extension.

ui/gl/test/gl_image_test_support.h

 // Copyright 2015 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.
 
 #ifndef UI_GL_TEST_GL_IMAGE_TEST_SUPPORT_H_
 #define UI_GL_TEST_GL_IMAGE_TEST_SUPPORT_H_
 
 #include "ui/gfx/buffer_types.h"
 #include "ui/gl/gl_bindings.h"
 
 namespace gfx {
 
 class GLImageTestSupport {
  public:
   // Initialize GL for image testing.
   static void InitializeGL();
 
   // Cleanup GL after being initialized for image testing.
   static void CleanupGL();
 
+  // Initialize buffers of a specific |format| to |color|.
+  static void SetBufferDataToColor(int width,
+                                   int height,
+                                   int strides[],
+                                   BufferFormat format,
+                                   const uint8_t color[4],
+                                   uint8_t* data[]);

[reveman, 2015/10/29 22:08:04]

Let's pass a plane argument to this function instead as discussed. I think that
will also eliminate the need for the helper function below.

[Daniele Castagna, 2015/10/30 23:51:57]

Done.

+
   // Initialize buffer of a specific |format| to |color|.
+  // This is useful for GpuMemoryBuffer formats with only
+  // one plane.
   static void SetBufferDataToColor(int width,
                                    int height,
                                    int stride,
                                    BufferFormat format,
                                    const uint8_t color[4],
                                    uint8_t* data);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_TEST_GL_IMAGE_TEST_SUPPORT_H_