UI changes for smaller devices and GTV. Fix for defect 4616102.

Change-Id: I2fc37199eedfd779494cf9e5c87f53fb1081c1eb

proprietary/samplePlayer/src/com/widevine/demo/AssetActivity.java

@@ -137,6 +137,7 @@ public abstract class AssetActivity extends Activity {
 
         Button next = new Button(this);
         next.setText(">>");
+        next.setTextSize(10);
         next.setOnClickListener(nextButtonListener);
 
         // Previous button listener
@@ -154,6 +155,7 @@ public abstract class AssetActivity extends Activity {
         };
         Button prev = new Button(this);
         prev.setText("<<");
+        prev.setTextSize(10);
         prev.setOnClickListener(prevButtonListener);
 
         LinearLayout buttons = new LinearLayout(this);