UI Fixes

> Adding a scrim to the longpress cling

Bug: 17573777

High level design asks (very low-risk)
> Changing the dialog to use device default theme
> Updating screenpanel assets

Change-Id: Ia0216b60fd8cd607d83a5e7c3d7e6c8255125eda

res/layout-land/longpress_cling.xml

@@ -4,6 +4,7 @@
     android:id="@+id/longpress_cling"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:background="@color/cling_scrim_background"
     android:orientation="vertical" >
 
     <Space

res/layout-port/longpress_cling.xml

@@ -3,7 +3,8 @@
     xmlns:launcher="http://schemas.android.com/apk/res-auto/com.android.launcher3"
     android:id="@+id/longpress_cling"
     android:layout_width="match_parent"
-    android:layout_height="match_parent" >
+    android:layout_height="match_parent"
+    android:background="@color/cling_scrim_background" >
 
     <FrameLayout
         android:id="@+id/cling_content"

res/layout-sw600dp-port/longpress_cling.xml

@@ -4,6 +4,7 @@
     android:id="@+id/longpress_cling"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:background="@color/cling_scrim_background"
     android:orientation="vertical" >
 
     <Space

res/values/colors.xml

@@ -22,6 +22,7 @@
          over the delete target or the info target -->
     <color name="delete_target_hover_tint">#DAFF0000</color>
     <color name="info_target_hover_tint">#DA0099CC</color>
+    <color name="cling_scrim_background">#80000000</color>
 
     <color name="bubble_dark_background">#20000000</color>
     <color name="focused_background">#80c6c5c5</color>

src/com/android/launcher3/Launcher.java

@@ -73,6 +73,7 @@ import android.text.TextUtils;
 import android.text.method.TextKeyListener;
 import android.util.DisplayMetrics;
 import android.util.Log;
+import android.view.ContextThemeWrapper;
 import android.view.Display;
 import android.view.Gravity;
 import android.view.HapticFeedbackConstants;
@@ -2555,7 +2556,7 @@ public class Launcher extends Activity
 
     private void showBrokenAppInstallDialog(final String packageName,
             DialogInterface.OnClickListener onSearchClickListener) {
-        new AlertDialog.Builder(this)
+        new AlertDialog.Builder(new ContextThemeWrapper(this, android.R.style.Theme_DeviceDefault))
             .setTitle(R.string.abandoned_promises_title)
             .setMessage(R.string.abandoned_promise_explanation)
             .setPositiveButton(R.string.abandoned_search, onSearchClickListener)