Binding media stream audio track to speech recognition - bugfix.

Shared memory initialization in unit test.

BUG=408940, 422164
TEST=Memory bot for content_unittests

Review URL: https://codereview.chromium.org/649613002

Cr-Commit-Position: refs/heads/master@{#299101}

content/renderer/media/speech_recognition_audio_sink_unittest.cc

@@ -116,11 +116,12 @@ class FakeSpeechRecognizer {
       const media::AudioParameters& sink_params,
       base::SharedMemoryHandle* foreign_memory_handle) {
     // Shared memory is allocated, mapped and shared.
-    uint32 shared_memory_size =
+    const uint32 kSharedMemorySize =
         sizeof(media::AudioInputBufferParameters) +
         media::AudioBus::CalculateMemorySize(sink_params);
     shared_memory_.reset(new base::SharedMemory());
-    ASSERT_TRUE(shared_memory_->CreateAndMapAnonymous(shared_memory_size));
+    ASSERT_TRUE(shared_memory_->CreateAndMapAnonymous(kSharedMemorySize));
+    memset(shared_memory_->memory(), 0, kSharedMemorySize);
     ASSERT_TRUE(shared_memory_->ShareToProcess(base::GetCurrentProcessHandle(),
                                                foreign_memory_handle));
 

tools/valgrind/drmemory/suppressions_full.txt

@@ -1860,8 +1860,3 @@ pdf.dll!pp::InputEvent_HandleEvent
 ppapi_proxy.dll!ppapi::CallWhileUnlocked<>
 ppapi_proxy.dll!ppapi::proxy::PPP_InputEvent_Proxy::OnMsgHandleFilteredInputEvent
 
-UNINITIALIZED READ
-name=bug_422164
-...
-content.dll!content::WebRtcLocalAudioTrack::Capture
-*!content::SpeechRecognitionAudioSinkTest*

tools/valgrind/memcheck/suppressions.txt

@@ -3485,10 +3485,3 @@
    fun:_ZNSt4listI13scoped_refptrIN5media10VideoFrameEESaIS3_EE9push_backERKS3_
    fun:_ZN5media14VideoFramePool8PoolImpl13FrameReleasedERK13scoped_refptrINS_10VideoFrameEE
 }
-{
-   bug_422164
-   Memcheck:Uninitialized
-   ...
-   fun:_ZN7content21WebRtcLocalAudioTrack7CaptureEPKsN4base9TimeDeltaEibb
-   fun:_ZN7content30SpeechRecognitionAudioSinkTest*
-}