Introduce bottom controls to CC and let it respond to scrolling

content/browser/android/content_view_core_impl.cc

Index: content/browser/android/content_view_core_impl.cc
diff --git a/content/browser/android/content_view_core_impl.cc b/content/browser/android/content_view_core_impl.cc
index 7d636b6f9cd372551f017f41d54572848b612c65..d04e4c235dff7985f15af762ccc45a23f45bf0a2 100644
--- a/content/browser/android/content_view_core_impl.cc
+++ b/content/browser/android/content_view_core_impl.cc
@@ -422,6 +422,8 @@ void ContentViewCoreImpl::UpdateFrameInfo(
     const gfx::SizeF& viewport_size,
     const gfx::Vector2dF& controls_offset,
     const gfx::Vector2dF& content_offset,
+    const gfx::Vector2dF& bottom_controls_offset,
+    const gfx::Vector2dF& bottom_controls_translate,
     bool is_mobile_optimized_hint,
     const gfx::SelectionBound& selection_start) {
   JNIEnv* env = AttachCurrentThread();
@@ -459,6 +461,8 @@ void ContentViewCoreImpl::UpdateFrameInfo(
       viewport_size.height(),
       controls_offset.y(),
       content_offset.y(),
+      bottom_controls_offset.y(),
+      bottom_controls_translate.y(),
       is_mobile_optimized_hint,
       has_insertion_marker,
       is_insertion_marker_visible,
@@ -779,7 +783,7 @@ gfx::Size ContentViewCoreImpl::GetViewSizeWithOSKHidden() const {
 gfx::Size ContentViewCoreImpl::GetViewSize() const {
   gfx::Size size = GetViewportSizeDip();
   if (DoTopControlsShrinkBlinkSize())
-    size.Enlarge(0, -GetTopControlsHeightDip());
+    size.Enlarge(0, -GetTopControlsHeightDip() - GetBottomControlsHeightDip());
   return size;
 }
 
@@ -811,6 +815,14 @@ int ContentViewCoreImpl::GetTopControlsHeightPix() const {
   return Java_ContentViewCore_getTopControlsHeightPix(env, j_obj.obj());
 }
 
+int ContentViewCoreImpl::GetBottomControlsHeightPix() const {
+  JNIEnv* env = AttachCurrentThread();
+  ScopedJavaLocalRef<jobject> j_obj = java_ref_.get(env);
+  if (j_obj.is_null())
+    return 0;
+  return Java_ContentViewCore_getBottomControlsHeightPix(env, j_obj.obj());
+}
+
 gfx::Size ContentViewCoreImpl::GetViewportSizeDip() const {
   return gfx::ScaleToCeiledSize(GetViewportSizePix(), 1.0f / dpi_scale());
 }
@@ -827,6 +839,10 @@ float ContentViewCoreImpl::GetTopControlsHeightDip() const {
   return GetTopControlsHeightPix() / dpi_scale();
 }
 
+float ContentViewCoreImpl::GetBottomControlsHeightDip() const {
+  return GetBottomControlsHeightPix() / dpi_scale();
+}
+
 void ContentViewCoreImpl::AttachLayer(scoped_refptr<cc::Layer> layer) {
   root_layer_->InsertChild(layer, 0);
   root_layer_->SetIsDrawable(false);