cc: Remove separate x/y raster scales.

cc/raster/bitmap_raster_buffer_provider.cc

Index: cc/raster/bitmap_raster_buffer_provider.cc
diff --git a/cc/raster/bitmap_raster_buffer_provider.cc b/cc/raster/bitmap_raster_buffer_provider.cc
index c92d5d66c740abf1f6f6caa4cf7ce4f47d2f9551..5ff8e4f1cee77676c6ac1926ae8c0a04e7c6adb7 100644
--- a/cc/raster/bitmap_raster_buffer_provider.cc
+++ b/cc/raster/bitmap_raster_buffer_provider.cc
@@ -40,7 +40,7 @@ class RasterBufferImpl : public RasterBuffer {
       const gfx::Rect& raster_full_rect,
       const gfx::Rect& raster_dirty_rect,
       uint64_t new_content_id,
-      const gfx::SizeF& scales,
+      float scale,
       const RasterSource::PlaybackSettings& playback_settings) override {
     TRACE_EVENT0("cc", "BitmapRasterBuffer::Playback");
     gfx::Rect playback_rect = raster_full_rect;
@@ -57,7 +57,7 @@ class RasterBufferImpl : public RasterBuffer {
     size_t stride = 0u;
     RasterBufferProvider::PlaybackToMemory(
         lock_.sk_bitmap().getPixels(), resource_->format(), resource_->size(),
-        stride, raster_source, raster_full_rect, playback_rect, scales,
+        stride, raster_source, raster_full_rect, playback_rect, scale,
         raster_color_space, playback_settings);
   }