Add optional visualization file writers to VideoProcessor tests.

webrtc/test/testsupport/frame_reader_unittest.cc

Index: webrtc/test/testsupport/frame_reader_unittest.cc
diff --git a/webrtc/test/testsupport/frame_reader_unittest.cc b/webrtc/test/testsupport/frame_reader_unittest.cc
index 58a3245fd4784a40b149f9362c498b74dd7d8788..ed4b1ca07f95dc58317ca0d48ffd72ca5ab43466 100644
--- a/webrtc/test/testsupport/frame_reader_unittest.cc
+++ b/webrtc/test/testsupport/frame_reader_unittest.cc
@@ -32,7 +32,7 @@ class FrameReaderTest: public testing::Test {
     fprintf(dummy, "%s", kInputFileContents.c_str());
     fclose(dummy);
 
-    frame_reader_ = new FrameReaderImpl(temp_filename_, 1, 1);
+    frame_reader_ = new YuvFrameReaderImpl(temp_filename_, 1, 1);
     ASSERT_TRUE(frame_reader_->Init());
   }
   void TearDown() {
@@ -45,7 +45,7 @@ class FrameReaderTest: public testing::Test {
 };
 
 TEST_F(FrameReaderTest, InitSuccess) {
-  FrameReaderImpl frame_reader(temp_filename_, 1, 1);
+  YuvFrameReaderImpl frame_reader(temp_filename_, 1, 1);
   ASSERT_TRUE(frame_reader.Init());
   ASSERT_EQ(kFrameLength, frame_reader.FrameLength());
   ASSERT_EQ(1, frame_reader.NumberOfFrames());
@@ -62,7 +62,7 @@ TEST_F(FrameReaderTest, ReadFrame) {
 }
 
 TEST_F(FrameReaderTest, ReadFrameUninitialized) {
-  FrameReaderImpl file_reader(temp_filename_, 1, 1);
+  YuvFrameReaderImpl file_reader(temp_filename_, 1, 1);
   ASSERT_FALSE(file_reader.ReadFrame());
 }