Implement disabling and enabling media tracks

media/test/pipeline_integration_test_base.cc

Index: media/test/pipeline_integration_test_base.cc
diff --git a/media/test/pipeline_integration_test_base.cc b/media/test/pipeline_integration_test_base.cc
index fe3e79743e0a92177b52f3d5661c2edddc3b5cab..633bf0de82ee3b41742c270192bcc2d88835c8ca 100644
--- a/media/test/pipeline_integration_test_base.cc
+++ b/media/test/pipeline_integration_test_base.cc
@@ -49,7 +49,7 @@ PipelineIntegrationTestBase::PipelineIntegrationTestBase()
       pipeline_status_(PIPELINE_OK),
       last_video_frame_format_(PIXEL_FORMAT_UNKNOWN),
       last_video_frame_color_space_(COLOR_SPACE_UNSPECIFIED) {
-  base::MD5Init(&md5_context_);
+  ResetVideoHash();
 }
 
 PipelineIntegrationTestBase::~PipelineIntegrationTestBase() {
@@ -367,9 +367,14 @@ void PipelineIntegrationTestBase::OnVideoFramePaint(
   if (!hashing_enabled_ || last_frame_ == frame)
     return;
   last_frame_ = frame;
+  DVLOG(3) << __FUNCTION__ << " pts=" << frame->timestamp().InSecondsF();
   VideoFrame::HashFrameForTesting(&md5_context_, frame);
 }
 
+void PipelineIntegrationTestBase::ResetVideoHash() {
+  base::MD5Init(&md5_context_);
+}
+
 std::string PipelineIntegrationTestBase::GetVideoHash() {
   DCHECK(hashing_enabled_);
   base::MD5Digest digest;