[Element / Autofill] Add boundsInViewportFloat() to fix <input> popup misalignment.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index a5aa8179f99dec9406c6b7687fa5e52afd36df4e..ce00cd5b8728441888360fc66b17a40d7277061a 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -1931,7 +1931,8 @@ void RenderViewImpl::focusedNodeChanged(const WebNode& fromNode,
   bool is_editable = false;
   if (!toNode.isNull() && toNode.isElementNode()) {
     WebElement element = const_cast<WebNode&>(toNode).to<WebElement>();
-    blink::WebRect rect = element.boundsInViewport();
+    // TODO(huangs): Use getElementBoundingBoxWindow().
+    blink::WebRect rect = element.boundsInViewportInt();
     convertViewportToWindow(&rect);
     node_bounds = gfx::Rect(rect);
     is_editable = element.isEditable();
@@ -2132,6 +2133,16 @@ void RenderViewImpl::convertViewportToWindow(blink::WebRect* rect) {
   RenderWidget::convertViewportToWindow(rect);
 }
 
+void RenderViewImpl::convertViewportToWindow(blink::WebFloatRect* rect) {
+  RenderWidget::convertViewportToWindow(rect);
+}
+
+void RenderViewImpl::getElementBoundingBoxWindow(
+    blink::WebElement* element, blink::WebFloatRect* rect) {
+  *rect = element->boundsInViewportFloat();
+  convertViewportToWindow(rect);
+}
+
 void RenderViewImpl::didChangeIcon(WebLocalFrame* frame,
                                    WebIconURL::Type icon_type) {
   if (frame->parent())