Resolve media/cast crypto crash, and add crash reporting.

media/cast/sender/vp8_encoder.h

Index: media/cast/sender/vp8_encoder.h
diff --git a/media/cast/sender/vp8_encoder.h b/media/cast/sender/vp8_encoder.h
index 8888097ac41faa4c5e6dbe8d38714ba564e568c4..180fbf00489d33ce8159672d08d13b79b4552b3a 100644
--- a/media/cast/sender/vp8_encoder.h
+++ b/media/cast/sender/vp8_encoder.h
@@ -114,6 +114,11 @@ class Vp8Encoder : public SoftwareVideoEncoder {
   // This is bound to the thread where Initialize() is called.
   base::ThreadChecker thread_checker_;
 
+  // Set to true once a frame with zero-length encoded data has been
+  // encountered.
+  // TODO(miu): Remove after discovering cause.  http://crbug.com/519022
+  bool has_seen_zero_length_encoded_frame_;
+
   DISALLOW_COPY_AND_ASSIGN(Vp8Encoder);
 };