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A new sub-class of BitmapDrawable has been created which tracks
when it is being used or cached when running on Gingerbread or
older. A new ImageView subclass has been added to accomplish this,
as well as changes to the LruCache.

Change-Id: I95d3334684703aebb6b09fcd56194cf73e3c2dcf
Signed-off-by: Chris Banes <chrisbanes@google.com>

Changes:
 -Use updated versions of ImageWorker & ImageCache from I/O 2012 app
 -Use copied DiskLruCache from system (rather than custom)
 -Use copied AsyncTask from system (to keep behavior consistent)
 -Ensure no strict mode violations or lint errors
 -Other misc bug fixes
 -Move single-use static methods in Utils to corresponding class

Change-Id: If21e045db1e1a80391169f3c9c9258d48345ab6b

Change-Id: I21da4e60f719b7159ada83894cca8d108bedd3d5

Change-Id: Ie41aee3fc805bf73ef0cd673049fcb608b59275c

- moves tablet-style layouts to layout-large* directories
- adds ContentActivity to host the ContentFragment when on phones
- adds an OnItemSelectedListener interface to TitlesFragment, which MainActivity
  implements in order to receive callbacks on click events to the list item and then
  pass the selected item to the ContentFragment in the manner appropriate for the
  current configuration... Specifically, when in two-pane mode, it updates the ContentFragment
  directly, and when in single-pane mode, it starts the ContentActivity with intent data
  about the selected item, which then updates the ContentFragment
- Change CameraSample.java to CameraActivity.java for name conventions
- Moves all menu strings into string resources
- Fixes camera sample to properly handle front-facing camera on other devices (was broken
  on nexus s and on g-slate)
- Fixes camera sample to handle resume state after the camera has changed (for example, when
  switched to a different camera, it would crash on resume)
- Moves various code around between classes as appropriate for the fragment handling the
  action. For example, move the ActionBar.TabListener implementation to the TitlesFragment
  (was originally impemented by the MainActivity)
- Adds logic to support devices without camera and properly declare the camera in manifest as such
- Maintains the state of hidden titles list across restarts

Change-Id: I27a39a68dee37325c0c3607aa0b56ab6c134d026

Change-Id: I61000b27b03e0381e5e60b2cfdd79d8619451cba

Change-Id: I1eefc2837016a7973544f0c57a8464466e7dcef9

Change-Id: Id98b6e542e1be5b9822a696936e735406c08500f