Track UMA stats for running out of tile memory

cc/resources/tile_manager.cc

 // Copyright 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 "cc/resources/tile_manager.h"
 
 #include <algorithm>
 #include <limits>
 #include <string>
 
@@ skipping 857 matching lines @@
   ever_exceeded_memory_budget_ |= oomed_hard;
   if (ever_exceeded_memory_budget_) {
     TRACE_COUNTER_ID2("cc",
                       "over_memory_budget",
                       this,
                       "budget",
                       global_state_.hard_memory_limit_in_bytes,
                       "over",
                       bytes_that_exceeded_memory_budget);
   }
+  UMA_HISTOGRAM_BOOLEAN("TileManager.ExceededMemoryBudget", oomed_hard);
   memory_stats_from_last_assign_.total_budget_in_bytes =
       global_state_.hard_memory_limit_in_bytes;
   memory_stats_from_last_assign_.bytes_allocated =
       hard_bytes_allocatable - hard_bytes_left;
   memory_stats_from_last_assign_.bytes_unreleasable =
       resource_pool_->acquired_memory_usage_bytes() - bytes_releasable_;
   memory_stats_from_last_assign_.bytes_over = bytes_that_exceeded_memory_budget;
 }
 
 void TileManager::FreeResourceForTile(Tile* tile, RasterMode mode) {
@@ skipping 688 matching lines @@
   TRACE_EVENT0("cc", "TileManager::CheckIfReadyToActivate");
 
   rasterizer_->CheckForCompletedTasks();
   did_check_for_completed_tasks_since_last_schedule_tasks_ = true;
 
   if (IsReadyToActivate())
     client_->NotifyReadyToActivate();
 }
 
 }  // namespace cc