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

third_party/WebKit/Source/web/WebElement.cpp

Index: third_party/WebKit/Source/web/WebElement.cpp
diff --git a/third_party/WebKit/Source/web/WebElement.cpp b/third_party/WebKit/Source/web/WebElement.cpp
index b365a2ccfc2b03784ef5a3ce27ac9a68743fcee6..ada8a1c346705def5c00730eee8b072ce4eb69fb 100644
--- a/third_party/WebKit/Source/web/WebElement.cpp
+++ b/third_party/WebKit/Source/web/WebElement.cpp
@@ -38,6 +38,7 @@
 #include "core/dom/custom/CustomElementProcessingStack.h"
 #include "core/html/HTMLTextFormControlElement.h"
 #include "platform/graphics/Image.h"
+#include "public/platform/WebFloatRect.h"
 #include "public/platform/WebRect.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/text/AtomicString.h"
@@ -146,9 +147,14 @@ bool WebElement::hasNonEmptyLayoutSize() const
     return constUnwrap<Element>()->hasNonEmptyLayoutSize();
 }
 
-WebRect WebElement::boundsInViewport()
+WebRect WebElement::boundsInViewportInt()
 {
-    return unwrap<Element>()->boundsInViewport();
+    return unwrap<Element>()->boundsInViewportInt();
+}
+
+WebFloatRect WebElement::boundsInViewportFloat()
+{
+    return unwrap<Element>()->boundsInViewportFloat();
 }
 
 WebImage WebElement::imageContents()