We should add a histogram to track the frequency of running

out of memory for tiles in the memory budget.

BUG= 368392

Review URL: https://codereview.chromium.org/362803002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282987 0039d316-1c4b-4281-b951-d872f2087c98

cc/resources/tile_manager.cc

@@ -875,6 +875,7 @@ void TileManager::AssignGpuMemoryToTiles(
                       "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 =

tools/metrics/histograms/histograms.xml

@@ -32203,6 +32203,15 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="TileManager.ExceededMemoryBudget" enum="TileMemoryBudget">
+  <owner>reveman@chromium.org</owner>
+  <owner>vmpstr@chromium.org</owner>
+  <summary>
+    Measures whether the tile manager exceeded the hard GPU memory budget
+    (OOMed). Recorded each time the tile manager assigns GPU memory to tiles.
+  </summary>
+</histogram>
+
 <histogram name="TimeZone.TimeZoneRequest.Event" enum="TimeZoneRequestEvent">
   <summary>Events in TimeZoneRequest.</summary>
 </histogram>
@@ -47288,6 +47297,11 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="9" label="No syn data + probe failed"/>
 </enum>
 
+<enum name="TileMemoryBudget" type="int">
+  <int value="0" label="Within memory budget"/>
+  <int value="1" label="Exceeded memory budget"/>
+</enum>
+
 <enum name="TimeZoneRequestEvent" type="int">
   <int value="0" label="Request start"/>
   <int value="1" label="Response success"/>