cc: Free gpu resources when we are invisible or TM is oom.

cc/resources/tile_manager.cc

Index: cc/resources/tile_manager.cc
diff --git a/cc/resources/tile_manager.cc b/cc/resources/tile_manager.cc
index 00ae3da6e92fed3b9a96a0d8e5b781df8541b4d8..fd12569f124175c3825d27acea00a9f1c5d56e7c 100644
--- a/cc/resources/tile_manager.cc
+++ b/cc/resources/tile_manager.cc
@@ -639,6 +639,8 @@ void TileManager::AssignGpuMemoryToTiles(
       if (tile_is_needed_now)
         had_enough_memory_to_schedule_tiles_needed_now = false;
       all_tiles_that_need_to_be_rasterized_are_scheduled_ = false;
+      // OOM, clear cache (applicable in gpu-raster case)
+      rasterizer_->ClearCache();

[sohanjg, 2015/03/17 11:20:18]

Will this be the only place to clear cache when OOM ?

[vmiura, 2015/03/19 21:20:35]

I don't think this is the OOM condition where we should clear the cache.

What I think we want is that we clear the cache when TileManager's hard memory
policy changes to 0 bytes.

[sohanjg, 2015/03/23 10:34:38]

Acknowledged.

[vmiura, 2015/03/23 20:34:39]

I'm not sure this is actually what we want to do.

What I think we want is that we clear the Ganesh cache when TileManager hard
memory limit is reduced to 0.

vmpstr@ could you provide some guidance?

       break;
     }