Introduce bottom controls to CC and let it respond to scrolling

content/public/android/java/src/org/chromium/content/browser/ContentViewClient.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewClient.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewClient.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewClient.java
index a365740d33cf2b5efc4a18bcfde39d8794c092f5..0b984e0f1a41cf8c9c197f92d4009d997e9e1b5c 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewClient.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewClient.java
@@ -43,12 +43,18 @@ public class ContentViewClient {
     }
 
     /**
-     * Notifies the client that the position of the top controls has changed.
-     * @param topControlsOffsetYPix The Y offset of the top controls in physical pixels.
-     * @param contentOffsetYPix The Y offset of the content in physical pixels.
+     * Notifies the client of the position of the top controls.
+     * @param topBarTranslate The Y offset of the top controls in physical pixels.
+     * @param topBarShown     The Y offset of the content in physical pixels.
      */
-    public void onOffsetsForFullscreenChanged(
-            float topControlsOffsetYPix, float contentOffsetYPix) { }
+    public void onTopControlsChanged(float topBarTranslate, float topBarShown) { }
+
+    /**
+     * Notifies the client of the position of the bottom controls.
+     * @param bottomBarTranslate  The Y offset of the bottom controls in physical pixels.
+     * @param bottomBarShown      The Y offset of the content in physical pixels.
+     */
+    public void onBottomControlsChanged(float bottomBarTranslate, float bottomBarShown) { }
 
     public boolean shouldOverrideKeyEvent(KeyEvent event) {
         int keyCode = event.getKeyCode();