gpu: Add YCbCr 420v extension.

ui/gl/gl_bindings.h

 // Copyright (c) 2012 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_GL_BINDINGS_H_
 #define UI_GL_GL_BINDINGS_H_
 
 #include <string>
 
 // Includes the platform independent and platform dependent GL headers.
@@ skipping 117 matching lines @@
 
 // GL_CHROMIUM_gpu_memory_buffer_image
 #define GL_READ_WRITE_CHROMIUM                           0x78F2
 
 // GL_CHROMIUM_yuv_420_image
 #define GL_RGB_YUV_420_CHROMIUM                          0x78FA
 
 // GL_CHROMIUM_ycbcr_422_image
 #define GL_RGB_YCBCR_422_CHROMIUM                        0x78FB
 
+// GL_CHROMIUM_ycbcr_420v_image
+#define GL_RGB_YCBCR_420V_CHROMIUM 0x78FC
+
 // GL_CHROMIUM_schedule_overlay_plane
 #define GL_OVERLAY_TRANSFORM_NONE_CHROMIUM               0x9245
 #define GL_OVERLAY_TRANSFORM_FLIP_HORIZONTAL_CHROMIUM    0x9246
 #define GL_OVERLAY_TRANSFORM_FLIP_VERTICAL_CHROMIUM      0x9247
 #define GL_OVERLAY_TRANSFORM_ROTATE_90_CHROMIUM          0x9248
 #define GL_OVERLAY_TRANSFORM_ROTATE_180_CHROMIUM         0x9249
 #define GL_OVERLAY_TRANSFORM_ROTATE_270_CHROMIUM         0x924A
 
 // GL_CHROMIUM_subscribe_uniforms
 #define GL_SUBSCRIBED_VALUES_BUFFER_CHROMIUM             0x924B
@@ skipping 328 matching lines @@
 #elif defined(OS_ANDROID)
 
 GL_EXPORT extern EGLApi* g_current_egl_context;
 GL_EXPORT extern DriverEGL g_driver_egl;
 
 #endif
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_BINDINGS_H_