Expose ycbcr_420v_image extension via capabilities.

This CL adds a flag in GPU capabilities that represents if the
extension CHROMIUM_ycbcr_420v_image is available.

BUG=524582

Review URL: https://codereview.chromium.org/1636123002

Cr-Commit-Position: refs/heads/master@{#371925}

gpu/command_buffer/common/capabilities.cc

@@ -76,6 +76,7 @@ Capabilities::Capabilities()
       blend_equation_advanced_coherent(false),
       texture_rg(false),
       image_ycbcr_422(false),
+      image_ycbcr_420v(false),
       render_buffer_format_bgra8888(false),
       occlusion_query_boolean(false),
       timer_queries(false),

gpu/command_buffer/common/capabilities.h

@@ -135,6 +135,7 @@ struct GPU_EXPORT Capabilities {
   bool blend_equation_advanced_coherent;
   bool texture_rg;
   bool image_ycbcr_422;
+  bool image_ycbcr_420v;
   bool render_buffer_format_bgra8888;
   bool occlusion_query_boolean;
   bool timer_queries;

gpu/command_buffer/service/gles2_cmd_decoder.cc

@@ -3155,6 +3155,8 @@ Capabilities GLES2DecoderImpl::GetCapabilities() {
   caps.texture_rg = feature_info_->feature_flags().ext_texture_rg;
   caps.image_ycbcr_422 =
       feature_info_->feature_flags().chromium_image_ycbcr_422;
+  caps.image_ycbcr_420v =
+      feature_info_->feature_flags().chromium_image_ycbcr_420v;
   caps.max_copy_texture_chromium_size =
       feature_info_->workarounds().max_copy_texture_chromium_size;
   caps.render_buffer_format_bgra8888 =

gpu/command_buffer/tests/gl_unittest.cc

@@ -116,6 +116,7 @@ TEST_F(GLTest, FeatureFlagsMatchCapabilities) {
             flags.blend_equation_advanced_coherent);
   EXPECT_EQ(caps.texture_rg, flags.ext_texture_rg);
   EXPECT_EQ(caps.image_ycbcr_422, flags.chromium_image_ycbcr_422);
+  EXPECT_EQ(caps.image_ycbcr_420v, flags.chromium_image_ycbcr_420v);
   EXPECT_EQ(caps.render_buffer_format_bgra8888,
             flags.ext_render_buffer_format_bgra8888);
   EXPECT_EQ(caps.occlusion_query_boolean, flags.occlusion_query_boolean);

gpu/ipc/gpu_command_buffer_traits_multi.h

@@ -103,6 +103,7 @@ IPC_STRUCT_TRAITS_BEGIN(gpu::Capabilities)
   IPC_STRUCT_TRAITS_MEMBER(blend_equation_advanced_coherent)
   IPC_STRUCT_TRAITS_MEMBER(texture_rg)
   IPC_STRUCT_TRAITS_MEMBER(image_ycbcr_422)
+  IPC_STRUCT_TRAITS_MEMBER(image_ycbcr_420v)
   IPC_STRUCT_TRAITS_MEMBER(render_buffer_format_bgra8888)
   IPC_STRUCT_TRAITS_MEMBER(occlusion_query_boolean)
   IPC_STRUCT_TRAITS_MEMBER(timer_queries)