Instrument ContextCacheController::OnIdle for postmortem reports

cc/output/context_cache_controller.cc

Index: cc/output/context_cache_controller.cc
diff --git a/cc/output/context_cache_controller.cc b/cc/output/context_cache_controller.cc
index 79e85b3e0336146e41e82aaaf4d0463e21d2e141..38e38c27aca62f9406bee243e5c9d442e2343f34 100644
--- a/cc/output/context_cache_controller.cc
+++ b/cc/output/context_cache_controller.cc
@@ -5,6 +5,7 @@
 #include "cc/output/context_cache_controller.h"
 
 #include "base/bind.h"
+#include "base/debug/activity_tracker.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/synchronization/lock.h"
@@ -158,8 +159,11 @@ void ContextCacheController::OnIdle(uint32_t idle_generation) {
     return;
   }
 
-  if (gr_context_)
+  if (gr_context_) {
+    // TODO(manzagop): remove ScopedActivity once crbug.com/703342 is fixed.
+    base::debug::ScopedActivity activity_free(0, 0, 0);

[bcwhite, 2017/03/21 12:34:38]

There is a default ctor that is (0,0,0) if you don't want to specify them...
though it's recommended that you do if you want to be able to identify them
during analysis.

[manzagop (departed), 2017/03/21 14:00:23]

Done. (Another option is to rely on the activity's address.)

     gr_context_->freeGpuResources();
+  }
 
   // Toggle SetAggressivelyFreeResources to drop command buffer data.
   context_support_->SetAggressivelyFreeResources(true);