Improve Android HW decoder error handling.

talk/app/webrtc/java/jni/androidmediacodeccommon.h

 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 74 matching lines @@
 
 // Return the (singleton) Java Enum object corresponding to |index|;
 // |state_class_fragment| is something like "MediaSource$State".
 static inline jobject JavaEnumFromIndex(
     JNIEnv* jni, const std::string& state_class_fragment, int index) {
   const std::string state_class = "org/webrtc/" + state_class_fragment;
   return JavaEnumFromIndex(jni, FindClass(jni, state_class.c_str()),
                            state_class, index);
 }
 
+// Checks for any Java exception, prints stack backtrace and clears
+// currently thrown exception.
+static inline bool CheckException(JNIEnv* jni) {
+  if (jni->ExceptionCheck()) {
+    ALOGE("Java JNI exception.");
+    jni->ExceptionDescribe();
+    jni->ExceptionClear();
+    return true;
+  }
+  return false;
+}
+
 }  // namespace webrtc_jni
 
 #endif  // TALK_APP_WEBRTC_JAVA_JNI_ANDROIDMEDIACODECCOMMON_H_