webapps: add splashscreen for installed webapps

chrome/android/java/res/layout/webapp_splashscreen.xml

Index: chrome/android/java/res/layout/webapp_splashscreen.xml
diff --git a/chrome/android/java/res/layout/webapp_splashscreen.xml b/chrome/android/java/res/layout/webapp_splashscreen.xml
index d90c66066a77d9837d1d3875107604eca375abd3..4f7b95219f2bf5972697429a3c0157cbaa0b6bb3 100644
--- a/chrome/android/java/res/layout/webapp_splashscreen.xml
+++ b/chrome/android/java/res/layout/webapp_splashscreen.xml
@@ -7,5 +7,20 @@
 -->
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical" />
+    android:layout_height="match_parent" >
+
+    <ImageView
+        android:id="@+id/webapp_splashscreen_icon"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:contentDescription="@null" />
+
+    <TextView
+        android:id="@+id/webapp_splashscreen_name"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="bottom|center_horizontal"
+        android:textAppearance="@style/WebAppSplashScreenTextAppearanceTitle"

[gone, 2015/09/04 18:25:55]

nit: group the layout_ attributes together instead of putting textAppearance in
the middle

[newt (away), 2015/09/04 18:45:48]

Since you're only using this style in one place, I wouldn't use a style at all.
Just add android:fontFamily, android:textSize, and android:textColor attributes
directly to this TextView.

[Lalit Maganti, 2015/09/04 19:12:02]

Done both.

+        android:layout_marginBottom="@dimen/webapp_splash_title_bottom_margin" />
+</FrameLayout>