Report GPU watchdog progress before and after glFinish.

glFinish has a fairly high chance of triggering the watchdog, make sure
it gets the most time possible by reporting progress before and after
calling glFinish.

Bug: chromium:1014259
Change-Id: I110ab8499b0d480a1f96e385093e044e8484cd57
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436951Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812738}

gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc

@@ -1289,8 +1289,14 @@ error::Error GLES2DecoderPassthroughImpl::DoFenceSync(GLenum condition,
 }
 
 error::Error GLES2DecoderPassthroughImpl::DoFinish() {
+  // Finish can take a long time, make sure the watchdog gives it the most
+  // amount of time to complete.
+  group_->ReportProgress();
+
   api()->glFinishFn();
 
+  group_->ReportProgress();
+
   error::Error error = ProcessReadPixels(true);
   if (error != error::kNoError) {
     return error;