[CI] Inline FloatSize::IsZero and FloatRoundedRect::IsZero

blink_perf.events.hit-test-lots-of-layers is a microbenchmark of
hit PaintLayer::HitTestLayer which uses GeometryMapper. One of the
hottest functions is GeometryMapper::LocalToClipRectInternal which
creates a lot of FloatClipRects that check FloatRoundedRect::IsZero
in their constructor. By inlining the IsZero functions, we get a
3%-4% improvement on the entire benchmark.

Bug: 818772
Change-Id: I0fb4c02152b799399aa19d521ba91ed46e326c3c
Reviewed-on: https://chromium-review.googlesource.com/966797Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543802}

third_party/WebKit/Source/platform/geometry/FloatRoundedRect.cpp

@@ -49,11 +49,6 @@ FloatRoundedRect::FloatRoundedRect(const FloatRect& rect,
                                    const FloatSize& bottom_right)
     : rect_(rect), radii_(top_left, top_right, bottom_left, bottom_right) {}
 
-bool FloatRoundedRect::Radii::IsZero() const {
-  return top_left_.IsZero() && top_right_.IsZero() && bottom_left_.IsZero() &&
-         bottom_right_.IsZero();
-}
-
 void FloatRoundedRect::Radii::Scale(float factor) {
   if (factor == 1)
     return;

third_party/WebKit/Source/platform/geometry/FloatRoundedRect.h

@@ -73,7 +73,10 @@ class PLATFORM_EXPORT FloatRoundedRect {
     const FloatSize& BottomLeft() const { return bottom_left_; }
     const FloatSize& BottomRight() const { return bottom_right_; }
 
-    bool IsZero() const;
+    bool IsZero() const {
+      return top_left_.IsZero() && top_right_.IsZero() &&
+             bottom_left_.IsZero() && bottom_right_.IsZero();
+    }
 
     void Scale(float factor);
     // Multiply all radii by |factor| and floor the result to the nearest

third_party/WebKit/Source/platform/geometry/FloatSize.cpp

@@ -46,11 +46,6 @@ float FloatSize::DiagonalLength() const {
   return hypotf(width_, height_);
 }
 
-bool FloatSize::IsZero() const {
-  return fabs(width_) < std::numeric_limits<float>::epsilon() &&
-         fabs(height_) < std::numeric_limits<float>::epsilon();
-}
-
 bool FloatSize::IsExpressibleAsIntSize() const {
   return isWithinIntRange(width_) && isWithinIntRange(height_);
 }

third_party/WebKit/Source/platform/geometry/FloatSize.h

@@ -70,7 +70,10 @@ class PLATFORM_EXPORT FloatSize {
   void SetHeight(float height) { height_ = height; }
 
   bool IsEmpty() const { return width_ <= 0 || height_ <= 0; }
-  bool IsZero() const;
+  bool IsZero() const {
+    return fabs(width_) < std::numeric_limits<float>::epsilon() &&
+           fabs(height_) < std::numeric_limits<float>::epsilon();
+  }
   bool IsExpressibleAsIntSize() const;
 
   float AspectRatio() const { return width_ / height_; }