Implement LauncherLayoutSnapshot pulled atom callback.

This change will pull only the workspace items but not the launcher settings such as grid layout etc. Future CLs will address it.

Bug: 181703659
Test: Manual-`statsd_testdrive 10108` http://gpaste/4894958784872448
Change-Id: I0e7d7da62034c411edb26ff9205a81b0e2e891a0
diff --git a/src/com/android/launcher3/LauncherAppState.java b/src/com/android/launcher3/LauncherAppState.java
index 86217d7..10023b4 100644
--- a/src/com/android/launcher3/LauncherAppState.java
+++ b/src/com/android/launcher3/LauncherAppState.java
@@ -138,10 +138,11 @@
         mContext = context;
 
         mInvariantDeviceProfile = InvariantDeviceProfile.INSTANCE.get(context);
-        mIconProvider =  new IconProvider(context, Themes.isThemedIconEnabled(context));
+        mIconProvider = new IconProvider(context, Themes.isThemedIconEnabled(context));
         mIconCache = new IconCache(mContext, mInvariantDeviceProfile,
                 iconCacheFileName, mIconProvider);
-        mModel = new LauncherModel(context, this, mIconCache, new AppFilter(mContext));
+        mModel = new LauncherModel(context, this, mIconCache, new AppFilter(mContext),
+                iconCacheFileName != null);
         mOnTerminateCallback.add(mIconCache::close);
     }
 
diff --git a/src/com/android/launcher3/LauncherModel.java b/src/com/android/launcher3/LauncherModel.java
index 9ebec0a..f38f662 100644
--- a/src/com/android/launcher3/LauncherModel.java
+++ b/src/com/android/launcher3/LauncherModel.java
@@ -126,10 +126,12 @@
         }
     };
 
-    LauncherModel(Context context, LauncherAppState app, IconCache iconCache, AppFilter appFilter) {
+    LauncherModel(Context context, LauncherAppState app, IconCache iconCache, AppFilter appFilter,
+            boolean isPrimaryInstance) {
         mApp = app;
         mBgAllAppsList = new AllAppsList(iconCache, appFilter);
-        mModelDelegate = ModelDelegate.newInstance(context, app, mBgAllAppsList, mBgDataModel);
+        mModelDelegate = ModelDelegate.newInstance(context, app, mBgAllAppsList, mBgDataModel,
+                isPrimaryInstance);
     }
 
     public ModelDelegate getModelDelegate() {
diff --git a/src/com/android/launcher3/model/ModelDelegate.java b/src/com/android/launcher3/model/ModelDelegate.java
index 13ec1ec..765141a 100644
--- a/src/com/android/launcher3/model/ModelDelegate.java
+++ b/src/com/android/launcher3/model/ModelDelegate.java
@@ -40,19 +40,21 @@
      * Creates and initializes a new instance of the delegate
      */
     public static ModelDelegate newInstance(
-            Context context, LauncherAppState app, AllAppsList appsList, BgDataModel dataModel) {
+            Context context, LauncherAppState app, AllAppsList appsList, BgDataModel dataModel,
+            boolean isPrimaryInstance) {
         ModelDelegate delegate = Overrides.getObject(
                 ModelDelegate.class, context, R.string.model_delegate_class);
-
         delegate.mApp = app;
         delegate.mAppsList = appsList;
         delegate.mDataModel = dataModel;
+        delegate.mIsPrimaryInstance = isPrimaryInstance;
         return delegate;
     }
 
     protected LauncherAppState mApp;
     protected AllAppsList mAppsList;
     protected BgDataModel mDataModel;
+    protected boolean mIsPrimaryInstance;
 
     public ModelDelegate() { }