37742976 - Catch bad gifs

* A security researcher crafted a gif that would cause the Android
Bitmap code to throw an NPE. That would cause messaging to crash when
decoding the NPE. The frameworks team is changing the underlying code to
throw an OutOfMemoryError instead of a NullPointerException.
In order to catch both errors, the code needs to catch Throwable.

Test: I added code to GifImageResource.getDrawable to throw a new
OutOfMemoryError and then used the debugger to verify it was caught by the
new catch Throwable statement. I did the same test with NullPointerException.
I tested attaching gif images and sending them to verify the gif path still
worked.

BUG=37742976

Change-Id: If71a7e65f8c0b083fe6c4b79f78358666338d59d

src/com/android/messaging/datamodel/media/GifImageResource.java

@@ -58,10 +58,10 @@ public class GifImageResource extends ImageResource {
     public Drawable getDrawable(Resources resources) {
         try {
             return new FrameSequenceDrawable(mFrameSequence);
-        } catch (final Exception e) {
+        } catch (final Throwable t) {
-            // Malicious gif images can make platform throw different kind of exceptions. Catch
+            // Malicious gif images can make the platform throw different kind of throwables, such
-            // them all.
+            // as OutOfMemoryError and NullPointerException. Catch them all.
-            LogUtil.e(LogUtil.BUGLE_TAG, "Error getting drawable for GIF", e);
+            LogUtil.e(LogUtil.BUGLE_TAG, "Error getting drawable for GIF", t);
             return null;
         }
     }