Correct the clear semantics for textures used by the GL_CHROMIUM_clopy_texture extension.

BUG=128207
TEST=GLCopyTextureCHROMIUMTest.*

Review URL: https://chromiumcodereview.appspot.com/10381157

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@137250 0039d316-1c4b-4281-b951-d872f2087c98

gpu/command_buffer/service/gles2_cmd_decoder.cc

@@ -8537,6 +8537,8 @@ void GLES2DecoderImpl::DoCopyTextureCHROMIUM(
     texture_manager()->SetLevelInfo(
         dest_info, GL_TEXTURE_2D, level, internal_format, source_width,
         source_height, 1, 0, internal_format, dest_type, true);
+  } else {
+    texture_manager()->SetLevelCleared(dest_info, GL_TEXTURE_2D, level);
   }
 
   state_dirty_ = true;