Merge "Adding Launcher3 callbacks for trimming memory." into ub-launcher3-almonte

src/com/android/launcher3/Launcher.java

@@ -3791,6 +3791,9 @@ public class Launcher extends Activity
             if (mAppsCustomizeTabHost != null) {
                 mAppsCustomizeTabHost.trimMemory();
             }
+            if (mLauncherCallbacks != null) {
+                mLauncherCallbacks.onTrimMemory(level);
+            }
         }
     }
 

src/com/android/launcher3/LauncherCallbacks.java

@@ -42,6 +42,7 @@ public interface LauncherCallbacks {
     public void dump(String prefix, FileDescriptor fd, PrintWriter w, String[] args);
     public void onHomeIntent();
     public boolean handleBackPressed();
+    public void onTrimMemory(int level);
 
     /*
      * Extension points for providing custom behavior on certain user interactions.

src/com/android/launcher3/LauncherExtension.java

@@ -107,6 +107,10 @@ public class LauncherExtension extends Launcher {
             return false;
         }
 
+        @Override
+        public void onTrimMemory(int level) {
+        }
+
         @Override
         public void onLauncherProviderChange() {
         }