Refactor to remove need for infiniteIntRect when computing rects in pre-paint

third_party/WebKit/Source/platform/graphics/paint/FloatClipRect.h

Index: third_party/WebKit/Source/platform/graphics/paint/FloatClipRect.h
diff --git a/third_party/WebKit/Source/platform/graphics/paint/FloatClipRect.h b/third_party/WebKit/Source/platform/graphics/paint/FloatClipRect.h
index bb09206751b592d16f75273fdfd39e9d2d27840f..b326c8e2a7b3e5ad83ae1d2b7a31a2ace51c26a3 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/FloatClipRect.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/FloatClipRect.h
@@ -45,6 +45,12 @@ class PLATFORM_EXPORT FloatClipRect {
     m_isInfinite = false;
   }
 
+  void moveBy(const FloatPoint& offset) {

[wkorman, 2017/02/16 21:45:32]

Maybe worth starting a FloatClipRectTest. Would obviously be pretty simple, but,
eh.

[chrishtr, 2017/02/16 23:48:32]

Done.

+    if (m_isInfinite)
+      return;
+    m_rect.moveBy(offset);
+  }
+
   bool isInfinite() const { return m_isInfinite; }
 
  private: