Oilpan: Enable Oilpan by default in modules/encryptedmedia

Source/platform/ThreadTimers.cpp

 /*
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 122 matching lines @@
         TRACE_EVENT2("blink", "ThreadTimers::sharedTimerFiredInternal",
             "src_file", timer.location().fileName(),
             "src_func", timer.location().functionName());
 
         // Once the timer has been fired, it may be deleted, so do nothing else with it after this point.
         timer.fired();
 
         // Catch the case where the timer asked timers to fire in a nested event loop, or we are over time limit.
         if (!m_firingTimers || timeToQuit < monotonicallyIncreasingTime())
             break;
+
+        ThreadState::current()->safePoint(ThreadState::NoHeapPointersOnStack);

[haraken, 2014/05/28 11:23:46]

The underlying issue is that a full GC is not invoked _immediately_ after
finishing the timer that called asyncGC(). (A full GC is invoked after finishing
the current event loop, which can contain a bunch of timers that can affect the
result of the GC e.g., MediaKeys::initializeNewSessionTimerFired.)

To address the issue, would it be possible to invoke a full GC _immediately_
after finishing the timer that called asyncGC()? The above change is doing that
and I confirmed that this fixes the test failure.

Note 1: I've not yet verified that it's OK to call safePoint with
NoHeapPointersOnStack from here.

Note 2: Either way, I'm planning to land this CL with a [Pass Failure] mark in
TestExpectation at the moment.

     }
 
     m_firingTimers = false;
 
     updateSharedTimer();
 }
 
 void ThreadTimers::fireTimersInNestedEventLoop()
 {
     // Reset the reentrancy guard so the timers can fire again.
     m_firingTimers = false;
     updateSharedTimer();
 }
 
 } // namespace WebCore