gfx: Make conversions from Size to SizeF be explicit.

cc/output/renderer_pixeltest.cc

Index: cc/output/renderer_pixeltest.cc
diff --git a/cc/output/renderer_pixeltest.cc b/cc/output/renderer_pixeltest.cc
index 8179bfae4acbc4b4781b414796f18d35b574cad9..832f96982d13af54d495929973c5e9ca65621ddc 100644
--- a/cc/output/renderer_pixeltest.cc
+++ b/cc/output/renderer_pixeltest.cc
@@ -2626,17 +2626,17 @@ TYPED_TEST(SoftwareRendererPixelTest, PictureDrawQuadNonIdentityScale) {
 
   PictureDrawQuad* green_quad1 =
       pass->CreateAndAppendDrawQuad<PictureDrawQuad>();
-  green_quad1->SetNew(top_right_green_shared_quad_state, green_rect1,
-                      gfx::Rect(), green_rect1, gfx::RectF(green_rect1.size()),
-                      green_rect1.size(), nearest_neighbor, texture_format,
-                      green_rect1, 1.f, green_pile.get());
+  green_quad1->SetNew(
+      top_right_green_shared_quad_state, green_rect1, gfx::Rect(), green_rect1,
+      gfx::RectF(gfx::SizeF(green_rect1.size())), green_rect1.size(),
+      nearest_neighbor, texture_format, green_rect1, 1.f, green_pile.get());
 
   PictureDrawQuad* green_quad2 =
       pass->CreateAndAppendDrawQuad<PictureDrawQuad>();
-  green_quad2->SetNew(top_right_green_shared_quad_state, green_rect2,
-                      gfx::Rect(), green_rect2, gfx::RectF(green_rect2.size()),
-                      green_rect2.size(), nearest_neighbor, texture_format,
-                      green_rect2, 1.f, green_pile.get());
+  green_quad2->SetNew(
+      top_right_green_shared_quad_state, green_rect2, gfx::Rect(), green_rect2,
+      gfx::RectF(gfx::SizeF(green_rect2.size())), green_rect2.size(),
+      nearest_neighbor, texture_format, green_rect2, 1.f, green_pile.get());
 
   // Add a green clipped checkerboard in the bottom right to help test
   // interleaving picture quad content and solid color content.