Report lost context from GLES2Implementation based on share group state.

gpu/command_buffer/client/query_tracker.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/client/query_tracker.h"
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 
@@ skipping 157 matching lines @@
   MarkAsActive();
   flush_count_ = gl->helper()->flush_generation();
   gl->helper()->QueryCounterEXT(id(), target(), shm_id(), shm_offset(),
                                 submit_count());
   MarkAsPending(gl->helper()->InsertToken());
 }
 
 bool QueryTracker::Query::CheckResultsAvailable(
     CommandBufferHelper* helper) {
   if (Pending()) {
-    if (base::subtle::Acquire_Load(&info_.sync->process_count) ==
-            submit_count_ ||
-        helper->IsContextLost()) {
+    bool processed_all =
+        base::subtle::Acquire_Load(&info_.sync->process_count) == submit_count_;
+    // We check lost on the command buffer itself here instead of checking the
+    // GLES2Implementation because the GLES2Implementation will not hear about
+    // the loss until we exit out of this call stack (to avoid re-entrancy), and
+    // we need be able to enter kComplete state on context loss.
+    // TODO(danakj): If GLES2Implementation can handle being notified of loss
+    // re-entrantly (without calling its clients re-entrantly), then we could
+    // call GLES2Implementation::GetGraphicsResetStatusKHR() here and remove
+    // this method from CommandBufferHelper.
+    if (processed_all || helper->IsContextLost()) {
       switch (target()) {
         case GL_COMMANDS_ISSUED_CHROMIUM:
           result_ = info_.sync->result;
           break;
         case GL_LATENCY_QUERY_CHROMIUM:
           // Disabled DCHECK because of http://crbug.com/419236.
           //DCHECK(info_.sync->result >= client_begin_time_us_);
           result_ = info_.sync->result - client_begin_time_us_;
           break;
         case GL_ASYNC_PIXEL_PACK_COMPLETED_CHROMIUM:
@@ skipping 194 matching lines @@
     if (local_disjoint_count_ != disjoint_count) {
       local_disjoint_count_ = disjoint_count;
       return true;
     }
   }
   return false;
 }
 
 }  // namespace gles2
 }  // namespace gpu