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

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index cb0944417a612a42d4176a4e3642d324ebeeec02..38a9200265f1ec40e65a238cecb5b32c9093def2 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -59,7 +59,6 @@
 #include "third_party/WebKit/public/platform/WebCursorInfo.h"
 #include "third_party/WebKit/public/platform/WebGraphicsContext3D.h"
 #include "third_party/WebKit/public/platform/WebPoint.h"
-#include "third_party/WebKit/public/platform/WebRect.h"
 #include "third_party/WebKit/public/platform/WebScreenInfo.h"
 #include "third_party/WebKit/public/platform/WebSize.h"
 #include "third_party/WebKit/public/platform/WebString.h"
@@ -76,6 +75,7 @@
 #include "ui/base/ui_base_switches.h"
 #include "ui/gfx/geometry/point_conversions.h"
 #include "ui/gfx/geometry/rect_conversions.h"
+#include "ui/gfx/geometry/rect_f.h"
 #include "ui/gfx/geometry/size_conversions.h"
 #include "ui/gfx/skia_util.h"
 #include "ui/gl/gl_switches.h"
@@ -1849,15 +1849,19 @@ void RenderWidget::showImeIfNeeded() {
 
 void RenderWidget::convertViewportToWindow(blink::WebRect* rect) {
   if (IsUseZoomForDSFEnabled()) {
-    float reverse = 1 / device_scale_factor_;
     // TODO(oshima): We may wait to allow pixel precision here as the the
     // anchor element can be placed at half pixel.
     gfx::Rect window_rect =
-        gfx::ScaleToEnclosedRect(gfx::Rect(*rect), reverse);
-    rect->x = window_rect.x();
-    rect->y = window_rect.y();
-    rect->width = window_rect.width();
-    rect->height = window_rect.height();
+        gfx::ScaleToEnclosedRect(gfx::Rect(*rect), 1 / device_scale_factor_);
+    *rect = window_rect;
+  }
+}
+
+void RenderWidget::convertViewportToWindow(blink::WebFloatRect* rect) {
+  if (IsUseZoomForDSFEnabled()) {
+    gfx::RectF window_rect = gfx::RectF(*rect);
+    window_rect.Scale(1 / device_scale_factor_);
+    *rect = window_rect;
   }
 }