Added ColorExtractionService and ExtractedColors.

- Launcher has an instance of ExtractedColors, which is loaded from
  LauncherProvider in onCreate() and whenever the wallpaper changes.
  - When the wallpaper changes, the ColorExtractionService is started
    in the :wallpaper-chooser process.
  - ColorExtractionService builds an ExtractedColors instance and saves
    it as a String in LauncherProvider.
  - When the results are saved, Launcher gets a callback through
    LauncherProviderChangeListener and reloads the ExtractedColors.
- Whenever Launcher loads Extractecolors, it also re-colors items
  (currently a no-op).

Change-Id: I319e2cfe0a86abcbc6bb39ef6b9fbbcad54ad743
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 418b1d2..80ffa43 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -141,6 +141,11 @@
             </intent-filter>
         </receiver>
 
+        <service android:name=".dynamicui.ColorExtractionService"
+            android:exported="false"
+            android:process=":wallpaper_chooser">
+        </service>
+
         <!-- The settings provider contains Home's data, like the workspace favorites -->
         <provider
             android:name="com.android.launcher3.LauncherProvider"