Use float for scroll offset.

third_party/WebKit/Source/platform/graphics/CompositorMutableState.cpp

Index: third_party/WebKit/Source/platform/graphics/CompositorMutableState.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/CompositorMutableState.cpp b/third_party/WebKit/Source/platform/graphics/CompositorMutableState.cpp
index 6313cbfe2c1f4822de8ce4bb795b76426d3954a5..9ed264d6b2f926a15c0be6aa1ae8b3d191e06bfe 100644
--- a/third_party/WebKit/Source/platform/graphics/CompositorMutableState.cpp
+++ b/third_party/WebKit/Source/platform/graphics/CompositorMutableState.cpp
@@ -45,11 +45,11 @@ void CompositorMutableState::setTransform(const SkMatrix44& matrix) {
   m_mutation->setTransform(matrix);
 }
 
-double CompositorMutableState::scrollLeft() const {
+float CompositorMutableState::scrollLeft() const {
   return m_scrollLayer ? m_scrollLayer->CurrentScrollOffset().x() : 0.0;
 }
 
-void CompositorMutableState::setScrollLeft(double scrollLeft) {
+void CompositorMutableState::setScrollLeft(float scrollLeft) {
   if (!m_scrollLayer)
     return;
 
@@ -64,11 +64,11 @@ void CompositorMutableState::setScrollLeft(double scrollLeft) {
   m_mutation->setScrollLeft(scrollLeft);
 }
 
-double CompositorMutableState::scrollTop() const {
+float CompositorMutableState::scrollTop() const {
   return m_scrollLayer ? m_scrollLayer->CurrentScrollOffset().y() : 0.0;
 }
 
-void CompositorMutableState::setScrollTop(double scrollTop) {
+void CompositorMutableState::setScrollTop(float scrollTop) {
   if (!m_scrollLayer)
     return;
   gfx::ScrollOffset offset = m_scrollLayer->CurrentScrollOffset();