See b/26741728. This fixes an issue reported by third party devs

in which the app sometimes crashes when locking/unlocking the device.

Change-Id: I3ba4e6d77b79bec2db0e4417fb09794b6ff07645

Author: pm0733464

visionSamples/barcode-reader/app/src/main/java/com/google/android/gms/samples/vision/barcodereader/ui/camera/CameraSource.java

@@ -861,6 +861,12 @@ void setNextFrame(byte[] data, Camera camera) {
                     mPendingFrameData = null;
                 }
 
+                if (!mBytesToByteBuffer.containsKey(data)) {
+                    Log.d(TAG, "Skipping frame.  Could not find ByteBuffer associated with the " +
+                          "image data from the camera.");
+                    return;
+                }
+
                 // Timestamp and frame ID are maintained here, which will give downstream code some
                 // idea of the timing of frames received and when frames were dropped along the way.
                 mPendingTimeMillis = SystemClock.elapsedRealtime() - mStartTimeMillis;
@@ -893,7 +899,7 @@ public void run() {
 
             while (true) {
                 synchronized (mLock) {
-                    if (mActive && (mPendingFrameData == null)) {
+                    while (mActive && (mPendingFrameData == null)) {
                         try {
                             // Wait for the next frame to be received from the camera, since we
                             // don't have it yet.