Restrict Gallery to phone-sized screens (#5662)

See https://github.com/flutter/flutter/issues/5570

examples/flutter_gallery/android/AndroidManifest.xml

@@ -8,6 +8,20 @@
     <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="21" />
     <uses-permission android:name="android.permission.INTERNET"/>
 
+    <!-- White-listing phones until Flutter's widgets and layouts have been tested for tablets. -->
+    <compatible-screens>
+        <!-- all small size screens -->
+        <screen android:screenSize="small" android:screenDensity="ldpi" />
+        <screen android:screenSize="small" android:screenDensity="mdpi" />
+        <screen android:screenSize="small" android:screenDensity="hdpi" />
+        <screen android:screenSize="small" android:screenDensity="xhdpi" />
+        <!-- all normal size screens -->
+        <screen android:screenSize="normal" android:screenDensity="ldpi" />
+        <screen android:screenSize="normal" android:screenDensity="mdpi" />
+        <screen android:screenSize="normal" android:screenDensity="hdpi" />
+        <screen android:screenSize="normal" android:screenDensity="xhdpi" />
+    </compatible-screens>
+
     <application android:icon="@mipmap/ic_launcher" android:label="Gallery" android:name="org.domokit.sky.shell.SkyApplication">
         <activity android:configChanges="orientation|keyboardHidden|keyboard|screenSize" android:hardwareAccelerated="true" android:launchMode="singleTask" android:name="org.domokit.sky.shell.SkyActivity" android:theme="@android:style/Theme.Black.NoTitleBar" android:screenOrientation="sensorPortrait">
             <intent-filter>