Convert plugin and GPU process to brokered handle duplication.

BUG=119250
Review URL: https://chromiumcodereview.appspot.com/9958034

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@132303 0039d316-1c4b-4281-b951-d872f2087c98
void WebGraphicsContext3DCommandBufferImpl::finish() {
  gl_->Finish();
  if (!visible_ && free_command_buffer_when_invisible_)
    gl_->FreeEverything();
}

void WebGraphicsContext3DCommandBufferImpl::finish() {
  gl_->Finish();
  if (!visible_ && free_command_buffer_when_invisible_)
    gl_->FreeEverything();
}
