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

third_party/WebKit/Source/platform/Widget.cpp

Index: third_party/WebKit/Source/platform/Widget.cpp
diff --git a/third_party/WebKit/Source/platform/Widget.cpp b/third_party/WebKit/Source/platform/Widget.cpp
index b2f9160f5b51893476552c9b31416dc9fdc713f5..2717891ea18c1c977ff8aaa566220bf3bbcf733d 100644
--- a/third_party/WebKit/Source/platform/Widget.cpp
+++ b/third_party/WebKit/Source/platform/Widget.cpp
@@ -88,6 +88,15 @@ IntRect Widget::convertToRootFrame(const IntRect& localRect) const
     return localRect;
 }
 
+FloatRect Widget::convertToRootFrame(const FloatRect& localRect) const
+{
+    if (const Widget* parentWidget = parent()) {
+        FloatRect parentRect = convertToContainingWidget(localRect);
+        return parentWidget->convertToRootFrame(parentRect);
+    }
+    return localRect;
+}
+
 IntPoint Widget::convertFromRootFrame(const IntPoint& pointInRootFrame) const
 {
     if (const Widget* parentWidget = parent()) {
@@ -146,6 +155,16 @@ IntRect Widget::convertFromContainingWidget(const IntRect& parentRect) const
     return parentRect;
 }
 
+FloatRect Widget::convertToContainingWidget(const FloatRect& localRect) const
+{
+    if (const Widget* parentWidget = parent()) {
+        FloatRect parentRect(localRect);
+        parentRect.setLocation(parentWidget->convertChildToSelf(this, localRect.location()));
+        return parentRect;
+    }
+    return localRect;
+}
+
 IntPoint Widget::convertToContainingWidget(const IntPoint& localPoint) const
 {
     if (const Widget* parentWidget = parent())
@@ -172,4 +191,9 @@ IntPoint Widget::convertSelfToChild(const Widget*, const IntPoint& point) const
     return point;
 }
 
+FloatPoint Widget::convertChildToSelf(const Widget*, const FloatPoint& point) const
+{
+    return point;
+}
+
 } // namespace blink