Redirect MediaLog to VLOG in pipeline integration tests

Change-Id: I352b0f8bf7f5206fc5846268dcb580b921d4f8e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1712566
Commit-Queue: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Auto-Submit: Wojciech Dzierżanowski <wdzierzanowski@opera.com>
Cr-Commit-Position: refs/heads/master@{#680539}

media/base/mock_media_log.cc

@@ -10,4 +10,10 @@ MockMediaLog::MockMediaLog() = default;
 
 MockMediaLog::~MockMediaLog() = default;
 
+void MockMediaLog::AddEventLocked(std::unique_ptr<MediaLogEvent> event) {
+  const auto log_string = MediaEventToLogString(*event);
+  VLOG(2) << "MediaLog: " << log_string;
+  DoAddEventLogString(log_string);
+}
+
 }  // namespace media

media/base/mock_media_log.h

@@ -43,9 +43,7 @@ class MockMediaLog : public MediaLog {
   // Trampoline method to workaround GMOCK problems with std::unique_ptr<>.
   // Also simplifies tests to be able to string match on the log string
   // representation on the added event.
-  void AddEventLocked(std::unique_ptr<MediaLogEvent> event) override {
-    DoAddEventLogString(MediaEventToLogString(*event));
-  }
+  void AddEventLocked(std::unique_ptr<MediaLogEvent> event) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockMediaLog);