Expose GL_VENDOR/GL_RENDERER strings to internal clients of GPU command buffer.

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 90939e70c32fb54088fd0d8800247ee00266b781..daa1f16029887f34e8d9f6fbb6da5d5769dbbcc4 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -12371,13 +12371,6 @@ error::Error GLES2DecoderImpl::HandleGetString(uint32_t immediate_data_size,
     case GL_SHADING_LANGUAGE_VERSION:
       str = GetServiceShadingLanguageVersionString(feature_info_.get());
       break;
-    case GL_RENDERER:

[Zhenyao Mo, 2017/03/20 18:27:56]

Note we remove the special handling, and they just default to the glGetString()
below.

-      str = GetServiceRendererString(feature_info_.get());
-      break;
-    case GL_VENDOR:
-      str = GetServiceVendorString(feature_info_.get());
-      break;
-      break;
     case GL_EXTENSIONS:
       {
         // For WebGL contexts, strip out shader extensions if they have not