Support video attachments through GalleryMediaChooser

GalleryMediaChooser supports video types and more image types also. And
video thumbnails are overlaid with the play button image to distinguish
between images and videos.

Note:
 1. EXTRA_ALLOW_MULTIPLE is not specified for ACTION_GET_CONTENT.
 2. Files, methods and variables' name are still including "image".
 3. Content descriptions are not updated.

Test: Manual

Change-Id: I961928f150e4ae8ee80a1fba2f20c37fb5426669
Signed-off-by: Taesu Lee <taesu82.lee@samsung.com>

src/com/android/messaging/ui/mediapicker/GalleryMediaChooser.java

@@ -63,7 +63,7 @@ class GalleryMediaChooser extends MediaChooser implements
         mAdapter.setHostInterface(null);
         // The loader is started only if startMediaPickerDataLoader() is called
         if (OsUtil.hasStoragePermission()) {
-            mBindingRef.getData().destroyLoader(MediaPickerData.GALLERY_IMAGE_LOADER);
+            mBindingRef.getData().destroyLoader(MediaPickerData.GALLERY_MEDIA_LOADER);
         }
         return super.destroyView();
     }
@@ -121,7 +121,7 @@ class GalleryMediaChooser extends MediaChooser implements
     protected View createView(final ViewGroup container) {
         final LayoutInflater inflater = getLayoutInflater();
         final View view = inflater.inflate(
-                R.layout.mediapicker_image_chooser,
+                R.layout.mediapicker_gallery_chooser,
                 container /* root */,
                 false /* attachToRoot */);
 
@@ -167,7 +167,7 @@ class GalleryMediaChooser extends MediaChooser implements
     public void onMediaPickerDataUpdated(final MediaPickerData mediaPickerData, final Object data,
             final int loaderId) {
         mBindingRef.ensureBound(mediaPickerData);
-        Assert.equals(MediaPickerData.GALLERY_IMAGE_LOADER, loaderId);
+        Assert.equals(MediaPickerData.GALLERY_MEDIA_LOADER, loaderId);
         Cursor rawCursor = null;
         if (data instanceof Cursor) {
             rawCursor = (Cursor) data;
@@ -202,8 +202,9 @@ class GalleryMediaChooser extends MediaChooser implements
     }
 
     private void startMediaPickerDataLoader() {
-        mBindingRef.getData().startLoader(MediaPickerData.GALLERY_IMAGE_LOADER, mBindingRef, null,
-                this);
+        mBindingRef
+                .getData()
+                .startLoader(MediaPickerData.GALLERY_MEDIA_LOADER, mBindingRef, null, this);
     }
 
     @Override