Creating a custom drawable to customize shadow.

> Fixing DrapTargetBar set to visible (with alpha = 0) in the start
causing unnecessary draw

Bug: 37616877
Change-Id: Iaaff96099910f504f6e2f81c9376ddacde50ff6a
diff --git a/res/values/attrs.xml b/res/values/attrs.xml
index 18f409f..18759f8 100644
--- a/res/values/attrs.xml
+++ b/res/values/attrs.xml
@@ -16,7 +16,7 @@
 */
 -->
 
-<resources>
+<resources xmlns:android="http://schemas.android.com/apk/res/android">
 
     <!-- BubbleTextView specific attributes. -->
     <declare-styleable name="BubbleTextView">
@@ -111,4 +111,8 @@
         </attr>
     </declare-styleable>
 
+    <declare-styleable name="ShadowDrawable">
+        <attr name="android:src" />
+        <attr name="android:shadowColor" />
+    </declare-styleable>
 </resources>
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index 75618b8..7dd9e53 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -146,6 +146,7 @@
     <dimen name="blur_size_medium_outline">2dp</dimen>
     <dimen name="blur_size_click_shadow">4dp</dimen>
     <dimen name="click_shadow_high_shift">2dp</dimen>
+    <dimen name="drawable_shadow_size">2dp</dimen>
 
 <!-- Pending widget -->
     <dimen name="pending_widget_min_padding">8dp</dimen>
diff --git a/res/values/drawables.xml b/res/values/drawables.xml
new file mode 100644
index 0000000..fea17b1
--- /dev/null
+++ b/res/values/drawables.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2017 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+<resources>
+    <drawable name="ic_info_shadow">@drawable/ic_info_no_shadow</drawable>
+    <drawable name="ic_remove_shadow">@drawable/ic_remove_no_shadow</drawable>
+    <drawable name="ic_uninstall_shadow">@drawable/ic_uninstall_no_shadow</drawable>
+</resources>
\ No newline at end of file