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

third_party/WebKit/Source/platform/Widget.h

Index: third_party/WebKit/Source/platform/Widget.h
diff --git a/third_party/WebKit/Source/platform/Widget.h b/third_party/WebKit/Source/platform/Widget.h
index d4697138afe4d6ed83df721e8767aacb6525734d..757a1d59975d10b26f6d47b571eaa0c3431d1d80 100644
--- a/third_party/WebKit/Source/platform/Widget.h
+++ b/third_party/WebKit/Source/platform/Widget.h
@@ -30,6 +30,7 @@
 
 #include "platform/PlatformExport.h"
 #include "platform/geometry/FloatPoint.h"
+#include "platform/geometry/FloatRect.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebFocusType.h"
@@ -100,6 +101,8 @@ public:
     IntRect convertToRootFrame(const IntRect&) const;
     IntRect convertFromRootFrame(const IntRect&) const;
 
+    FloatRect convertToRootFrame(const FloatRect&) const;
+
     IntPoint convertToRootFrame(const IntPoint&) const;
     IntPoint convertFromRootFrame(const IntPoint&) const;
     FloatPoint convertFromRootFrame(const FloatPoint&) const;
@@ -111,6 +114,9 @@ public:
 
     virtual IntRect convertToContainingWidget(const IntRect&) const;
     virtual IntRect convertFromContainingWidget(const IntRect&) const;
+
+    virtual FloatRect convertToContainingWidget(const FloatRect&) const;
+
     virtual IntPoint convertToContainingWidget(const IntPoint&) const;
     virtual IntPoint convertFromContainingWidget(const IntPoint&) const;
 
@@ -118,6 +124,8 @@ public:
     virtual IntPoint convertChildToSelf(const Widget*, const IntPoint&) const;
     virtual IntPoint convertSelfToChild(const Widget*, const IntPoint&) const;
 
+    virtual FloatPoint convertChildToSelf(const Widget*, const FloatPoint&) const;
+
     // Notifies this widget that it will no longer be receiving events.
     virtual void eventListenersRemoved() { }