New icon to dump heap information and share it.

Alternatively,
  $ adb shell am start -n <pkg>/com.android.launcher3.MemoryDumpActivity

Change-Id: I8c615ec3abffaf6ad693c93bdf569550d8f97298
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 7f3c482..0253103 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -1041,7 +1041,7 @@
             mSearchDropTargetBar.setup(this, dragController);
         }
 
-        if (DEBUG_MEMORY) {
+        if (getResources().getBoolean(R.bool.debug_memory_enabled)) {
             Log.v(TAG, "adding WeightWatcher");
             ((FrameLayout) mLauncherView).addView(new WeightWatcher(this),
                     new FrameLayout.LayoutParams(