[Android, UMA, MediaFling] Add UMA for how much time users spend casting media without the media el…

chrome/android/java/src/org/chromium/chrome/browser/media/remote/RecordCastAction.java

Index: chrome/android/java/src/org/chromium/chrome/browser/media/remote/RecordCastAction.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/media/remote/RecordCastAction.java b/chrome/android/java/src/org/chromium/chrome/browser/media/remote/RecordCastAction.java
index ee4cdda79a94f2458551407e9f659e2173e2de7d..92d9440c6242711a9036b46be83615bde51d764d 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/media/remote/RecordCastAction.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/media/remote/RecordCastAction.java
@@ -122,6 +122,20 @@ public class RecordCastAction {
         }
     }
 
+    /**
+     * Record the ratio of the time the remote playback continued without the media element vs the
+     * total duration of remote playback (from when the element has been attached till when the
+     * playback stopped), in percents.

[aberent, 2016/02/04 16:44:25]

As written this includes pause time. Is this what you intend? If so, maybe
clarify this in the comment.

[whywhat, 2016/02/05 19:29:58]

Yes, my intent is the amount of time the media element is not available compared
to the total duration of the cast session, no matter if the video is being
played or not.

+     *
+     * @param percentage The ratio in percents.
+     */
+    public static void recordRemotePlaybackTimeWithoutMediaElementPercentage(int percentage) {
+        if (LibraryLoader.isInitialized()) {
+            RecordHistogram.recordEnumeratedHistogram(

[Mark P, 2016/02/03 22:44:57]

What's wrong with recordPercentageHistogram?

[whywhat, 2016/02/05 19:29:57]

Only that it's too far from the top of of the RecordHistogram file :)

+                    "Cast.Sender.PlaybackTimeWithoutMediaElementPercentage", percentage, 101);
+        }
+    }
+
     // Cast sending
     private static native void nativeRecordRemotePlaybackDeviceSelected(int deviceType);
     private static native void nativeRecordCastPlayRequested();