Make the FloatSize constructor from an IntSize explicit.

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp

Index: third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
diff --git a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
index 2fc71ec96469d625e50418ccf0b4bc094c3f575c..248855913c90503a327d2f8bdb1326f34b01938e 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
+++ b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp
@@ -1226,7 +1226,7 @@ void WebGLRenderingContextBase::markContextChanged(ContentChangeType changeType)
     } else {
         if (!m_markedCanvasDirty) {
             m_markedCanvasDirty = true;
-            canvas()->didDraw(FloatRect(FloatPoint(0, 0), clampedCanvasSize()));
+            canvas()->didDraw(FloatRect(FloatPoint(0, 0), FloatSize(clampedCanvasSize())));
         }
     }
 }