cc: Refactor content scale/bounds into draw properties

cc/image_layer.cc

Index: cc/image_layer.cc
diff --git a/cc/image_layer.cc b/cc/image_layer.cc
index f3819faf3dd236f478f694bd9f64f3a8211d4cd6..695def5c347ad344020dd6e2d3e419aaab483486 100644
--- a/cc/image_layer.cc
+++ b/cc/image_layer.cc
@@ -74,9 +74,11 @@ LayerUpdater* ImageLayer::updater() const
     return m_updater.get();
 }
 
-gfx::Size ImageLayer::contentBounds() const
+void ImageLayer::updateContentsScale(float ideal_contents_scale)
 {
-    return gfx::Size(m_bitmap.width(), m_bitmap.height());
+    m_drawProperties.contents_scale_x = imageContentsScaleX();
+    m_drawProperties.contents_scale_y = imageContentsScaleY();
+    m_drawProperties.content_bounds = gfx::Size(m_bitmap.width(), m_bitmap.height());
 }
 
 bool ImageLayer::drawsContent() const
@@ -84,16 +86,16 @@ bool ImageLayer::drawsContent() const
     return !m_bitmap.isNull() && TiledLayer::drawsContent();
 }
 
-float ImageLayer::contentsScaleX() const
+float ImageLayer::imageContentsScaleX() const
 {
-    if (bounds().IsEmpty() || contentBounds().IsEmpty())
+    if (bounds().IsEmpty() || m_bitmap.width() == 0)
         return 1;
     return static_cast<float>(m_bitmap.width()) / bounds().width();
 }
 
-float ImageLayer::contentsScaleY() const
+float ImageLayer::imageContentsScaleY() const
 {
-    if (bounds().IsEmpty() || contentBounds().IsEmpty())
+    if (bounds().IsEmpty() || m_bitmap.height() == 0)
         return 1;
     return static_cast<float>(m_bitmap.height()) / bounds().height();
 }