Make the LayoutRect->FloatRect constructor explicit.

Source/core/paint/DeprecatedPaintLayer.cpp

Index: Source/core/paint/DeprecatedPaintLayer.cpp
diff --git a/Source/core/paint/DeprecatedPaintLayer.cpp b/Source/core/paint/DeprecatedPaintLayer.cpp
index 7efcb1de19bc2510a2d8fdf498145e7b3b390274..fc291b9f1bdaa04b0e22f94d7d32de1bf9b80ee5 100644
--- a/Source/core/paint/DeprecatedPaintLayer.cpp
+++ b/Source/core/paint/DeprecatedPaintLayer.cpp
@@ -1561,7 +1561,7 @@ PassRefPtr<HitTestingTransformState> DeprecatedPaintLayer::createLocalTransformS
     } else {
         // If this is the first time we need to make transform state, then base it off of hitTestLocation,
         // which is relative to rootLayer.
-        transformState = HitTestingTransformState::create(hitTestLocation.transformedPoint(), hitTestLocation.transformedRect(), FloatQuad(hitTestRect));
+        transformState = HitTestingTransformState::create(hitTestLocation.transformedPoint(), hitTestLocation.transformedRect(), FloatQuad(FloatRect(hitTestRect)));
         convertToLayerCoords(rootLayer, offset);
     }
     offset.moveBy(translationOffset);
@@ -2165,7 +2165,7 @@ LayoutRect DeprecatedPaintLayer::boundingBoxForCompositing(const DeprecatedPaint
         return LayoutRect();
 
     LayoutRect result = clipper().localClipRect();
-    if (result == LayoutRect::infiniteIntRect()) {
+    if (IntRect(result) == LayoutRect::infiniteIntRect()) {

[jbroman, 2015/08/26 19:06:43]

I don't know what this method is doing right now, but currently this is not the
conversion that would have happened previously. Previously we would have
converted the IntRect to LayoutRect and used operator== on LayoutRects.

There's a loss of precision in the LayoutRect->IntRect conversion; if you intend
to make this functional change, I'd rather it be a separate CL where it's not
mixed in with mechanical changes.

[chrishtr, 2015/08/26 20:53:51]

Fixed this, and the one I already committed that was in
https://codereview.chromium.org/1303413004.

         LayoutPoint origin;
         result = physicalBoundingBox(ancestorLayer, &origin);