gpu: Make CopyTexture work with GL_BGRA_EXT destination textures.

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 2aa4407a930ec6ef00535bb20f4771e60fff8460..b50b52f8f4ccef45aa76f9a8c7098d64822682c5 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -10066,8 +10066,9 @@ void GLES2DecoderImpl::DoCopyTextureCHROMIUM(
   // The destination format should be GL_RGB, or GL_RGBA. GL_ALPHA,
   // GL_LUMINANCE, and GL_LUMINANCE_ALPHA are not supported because they are not
   // renderable on some platforms.
-  bool valid_dest_format =
-      internal_format == GL_RGB || internal_format == GL_RGBA;
+  bool valid_dest_format = internal_format == GL_RGB ||
+                           internal_format == GL_RGBA ||
+                           internal_format == GL_BGRA_EXT;
   bool valid_source_format = source_internal_format == GL_ALPHA ||
                              source_internal_format == GL_RGB ||
                              source_internal_format == GL_RGBA ||