Introduce bottom controls to CC and let it respond to scrolling

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

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index 7de8b4ae1d59448eb065e245f793592f7f3cf859..76c8487bed22e1cfa170937f8c71cf4b23061048 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -227,7 +227,7 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
 
             // The anchor view should not go outside the bounds of the ContainerView.
             int leftMargin = Math.round(x * scale);
-            int topMargin = Math.round(mRenderCoordinates.getContentOffsetYPix() + y * scale);
+            int topMargin = Math.round(mRenderCoordinates.getTopControlsShownYPix() + y * scale);
             int scaledWidth = Math.round(width * scale);
             // ContentViewCore currently only supports these two container view types.
             if (containerView instanceof FrameLayout) {
@@ -501,6 +501,7 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
     private int mPhysicalBackingWidthPix;
     private int mPhysicalBackingHeightPix;
     private int mTopControlsHeightPix;
+    private int mBottomControlsHeightPix;
     private boolean mTopControlsShrinkBlinkSize;
 
     // Cached copy of all positions and scales as reported by the renderer.
@@ -698,6 +699,15 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
     }
 
     /**
+     * Sets the height of the bottom controls. If necessary, triggers a renderer resize.
+     */
+    public void setBottomControlsHeight(int bottomControlHeightPix) {
+        if (mBottomControlsHeightPix == bottomControlHeightPix) return;
+        mBottomControlsHeightPix = bottomControlHeightPix;
+        if (mNativeContentViewCore != 0) nativeWasResized(mNativeContentViewCore);
+    }
+
+    /**
      * Returns a delegate that can be used to add and remove views from the current
      * container view. Clients can safely hold to instances of this class as it handles the
      * replacement of container views transparently.
@@ -1096,6 +1106,11 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
         return mTopControlsHeightPix;
     }
 
+    @CalledByNative
+    public int getBottomControlsHeightPix() {
+        return mBottomControlsHeightPix;
+    }
+
     /**
      * @return Current device scale factor (maps DIP pixels to physical pixels).
      */
@@ -2126,7 +2141,7 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
                     // The selection coordinates are relative to the content viewport, but we need
                     // coordinates relative to the containing View.
                     outRect.set(mSelectionRect);
-                    outRect.offset(0, (int) mRenderCoordinates.getContentOffsetYPix());
+                    outRect.offset(0, (int) mRenderCoordinates.getTopControlsShownYPix());
                 }
 
                 @Override
@@ -2372,7 +2387,8 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
             float pageScaleFactor, float minPageScaleFactor, float maxPageScaleFactor,
             float contentWidth, float contentHeight,
             float viewportWidth, float viewportHeight,
-            float controlsOffsetYCss, float contentOffsetYCss,
+            float topBarTranslateYCss, float topBarShownYCss,
+            float bottomBarTranslateYCss, float bottomBarShownYCss,
             boolean isMobileOptimizedHint,
             boolean hasInsertionMarker, boolean isInsertionMarkerVisible,
             float insertionMarkerHorizontal, float insertionMarkerTop,
@@ -2386,7 +2402,7 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
                 mViewportWidthPix / (deviceScale * pageScaleFactor));
         contentHeight = Math.max(contentHeight,
                 mViewportHeightPix / (deviceScale * pageScaleFactor));
-        final float contentOffsetYPix = mRenderCoordinates.fromDipToPix(contentOffsetYCss);
+        final float topBarShownPix = mRenderCoordinates.fromDipToPix(topBarShownYCss);
 
         final boolean contentSizeChanged =
                 contentWidth != mRenderCoordinates.getContentWidthCss()
@@ -2400,8 +2416,8 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
                 pageScaleChanged
                 || scrollOffsetX != mRenderCoordinates.getScrollX()
                 || scrollOffsetY != mRenderCoordinates.getScrollY();
-        final boolean contentOffsetChanged =
-                contentOffsetYPix != mRenderCoordinates.getContentOffsetYPix();
+        final boolean topBarChanged = topBarShownPix != mRenderCoordinates
+                .getTopControlsShownYPix();
 
         final boolean needHidePopupZoomer = contentSizeChanged || scrollChanged;
         final boolean needUpdateZoomControls = scaleLimitsChanged || scrollChanged;
@@ -2421,9 +2437,9 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
                 contentWidth, contentHeight,
                 viewportWidth, viewportHeight,
                 pageScaleFactor, minPageScaleFactor, maxPageScaleFactor,
-                contentOffsetYPix);
+                topBarShownPix);
 
-        if (scrollChanged || contentOffsetChanged) {
+        if (scrollChanged || topBarChanged) {
             for (mGestureStateListenersIterator.rewind();
                     mGestureStateListenersIterator.hasNext();) {
                 mGestureStateListenersIterator.next().onScrollOffsetOrExtentChanged(
@@ -2435,10 +2451,10 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
         if (needUpdateZoomControls) mZoomControlsDelegate.updateZoomControls();
 
         // Update offsets for fullscreen.
-        final float controlsOffsetPix = controlsOffsetYCss * deviceScale;
-        // TODO(aelias): Remove last argument after downstream removes it.
-        getContentViewClient().onOffsetsForFullscreenChanged(
-                controlsOffsetPix, contentOffsetYPix);
+        final float topBarTranslatePix = topBarTranslateYCss * deviceScale;
+        getContentViewClient().onTopControlsChanged(topBarTranslatePix, topBarShownPix);
+        getContentViewClient().onBottomControlsChanged(bottomBarTranslateYCss * deviceScale,
+                bottomBarShownYCss * deviceScale);
 
         if (mBrowserAccessibilityManager != null) {
             mBrowserAccessibilityManager.notifyFrameInfoInitialized();
@@ -2649,11 +2665,11 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
         }
 
         if (!mHasInsertion || !canPaste()) return false;
-        final float contentOffsetYPix = mRenderCoordinates.getContentOffsetYPix();
+        final float topControlsShown = mRenderCoordinates.getTopControlsShownYPix();
         PastePopupMenu pastePopupMenu = getPastePopup();
         if (pastePopupMenu == null) return false;
         try {
-            pastePopupMenu.show(x, (int) (y + contentOffsetYPix));
+            pastePopupMenu.show(x, (int) (y + topControlsShown));
         } catch (WindowManager.BadTokenException e) {
             return false;
         }
@@ -3106,7 +3122,7 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
         Rect boundsInParent = new Rect(left, top, left + width, top + height);
         if (node.isRootNode) {
             // Offset of the web content relative to the View.
-            boundsInParent.offset(0, (int) mRenderCoordinates.getContentOffsetYPix());
+            boundsInParent.offset(0, (int) mRenderCoordinates.getTopControlsShownYPix());
             if (!ignoreScrollOffset) {
                 boundsInParent.offset(-(int) mRenderCoordinates.getScrollXPix(),
                         -(int) mRenderCoordinates.getScrollYPix());