Move OnDecoderInitDone() from decoder to pipeline thread.

media/filters/audio_renderer_impl_unittest.cc

Index: media/filters/audio_renderer_impl_unittest.cc
diff --git a/media/filters/audio_renderer_impl_unittest.cc b/media/filters/audio_renderer_impl_unittest.cc
index fe901f099465cc591d457303f3dac321e6ca7e73..4fe9967a2f6bcddf81bba2db69fe5029f922bc72 100644
--- a/media/filters/audio_renderer_impl_unittest.cc
+++ b/media/filters/audio_renderer_impl_unittest.cc
@@ -5,6 +5,7 @@
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/gtest_prod_util.h"
+#include "base/message_loop.h"
 #include "base/stl_util.h"
 #include "media/base/data_buffer.h"
 #include "media/base/mock_audio_renderer_sink.h"
@@ -58,6 +59,7 @@ class AudioRendererImplTest : public ::testing::Test {
   }
 
   virtual ~AudioRendererImplTest() {
+    message_loop_.RunAllPending();
     renderer_->Stop(NewExpectedClosure());
   }
 
@@ -101,6 +103,7 @@ class AudioRendererImplTest : public ::testing::Test {
         .WillOnce(RunPipelineStatusCB1(PIPELINE_OK));
 
     InitializeWithStatus(PIPELINE_OK);
+    message_loop_.RunAllPending();
   }
 
   void InitializeWithStatus(PipelineStatus expected) {
@@ -127,6 +130,7 @@ class AudioRendererImplTest : public ::testing::Test {
     EXPECT_CALL(*decoder_, Read(_));
     renderer_->Preroll(base::TimeDelta(), NewPrerollCB());
     EXPECT_CALL(*this, OnPrerollComplete(PIPELINE_OK));
+    message_loop_.RunAllPending();
     DeliverRemainingAudio();
   }
 
@@ -229,6 +233,7 @@ class AudioRendererImplTest : public ::testing::Test {
   AudioRendererImpl::AudioDecoderList decoders_;
   AudioDecoder::ReadCB read_cb_;
   base::TimeDelta next_timestamp_;
+  MessageLoop message_loop_;
 
  private:
   void SaveReadCallback(const AudioDecoder::ReadCB& callback) {