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 929b80462157b8ab6cd553799338761b0e61b28a..1a8ac0d6e92e818c9a12cdd456070c9f0a16dc11 100644
--- a/media/test/pipeline_integration_test_base.cc
+++ b/media/test/pipeline_integration_test_base.cc
@@ -51,7 +51,7 @@ 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() {
@@ -212,6 +212,7 @@ bool PipelineIntegrationTestBase::Seek(base::TimeDelta seek_time) {
   pipeline_->Seek(seek_time, base::Bind(&PipelineIntegrationTestBase::OnSeeked,
                                         base::Unretained(this), seek_time));
   base::RunLoop().Run();
+  EXPECT_CALL(*this, OnBufferingStateChange(_)).Times(AnyNumber());
   return (pipeline_status_ == PIPELINE_OK);
 }
 
@@ -372,9 +373,15 @@ 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() {
+  DVLOG(1) << __FUNCTION__;
+  base::MD5Init(&md5_context_);
+}
+
 std::string PipelineIntegrationTestBase::GetVideoHash() {
   DCHECK(hashing_enabled_);
   base::MD5Digest digest;