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/proguard.flags b/proguard.flags
index ada6226..7397088 100644
--- a/proguard.flags
+++ b/proguard.flags
@@ -62,3 +62,7 @@
 -keep class com.android.launcher3.ClippedImageView {
   *;
 }
+
+-keep class com.android.launcher3.MemoryDumpActivity {
+  *;
+}