Enable CopyTextureCHROMIUM in Blink for Tex{Sub}Image2D with more cases

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 992ad25f100b7d5cf2fd7f3381e741acfe19b34e..2c192ed60c97b9adc311cfe6fc1e207d42c662df 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -16425,6 +16425,13 @@ CopyTextureMethod GLES2DecoderImpl::getCopyTextureCHROMIUMMethod(
       Texture::ColorRenderable(GetFeatureInfo(), dest_internal_format, false);
   std::string output_error_msg;
 
+  // Make sure source_type has value for unsized source internalformat.
+  if (!GLES2Util::IsSizedColorFormat(source_internal_format) && !source_type) {
+    source_type =
+        TextureManager::ExtractTypeFromStorageFormat(source_internal_format);
+  }

[qiankun, 2017/03/09 08:53:02]

This code can be removed once the issue in
https://codereview.chromium.org/2711903002/ is fixed.

[Zhenyao Mo, 2017/03/10 00:10:23]

Can you add it into a TODO in the code? Otherwise it might get lost

[qiankun, 2017/03/10 02:48:04]

Done.

+  DCHECK(GLES2Util::IsSizedColorFormat(source_internal_format) || source_type);
+
   // CopyTexImage* should not allow internalformat of GL_BGRA_EXT and
   // GL_BGRA8_EXT. crbug.com/663086.
   bool copy_tex_image_format_valid =