Don't invert contentsDeviceTransform twice when rendering render passes.

cc/software_renderer.cc

Index: cc/software_renderer.cc
diff --git a/cc/software_renderer.cc b/cc/software_renderer.cc
index a32160d55c42c40689f19b1320f0f227f0f001c1..e8ade9052d294d9368b7b5cbdb1d706b8aa7e90c 100644
--- a/cc/software_renderer.cc
+++ b/cc/software_renderer.cc
@@ -182,9 +182,9 @@ void SoftwareRenderer::drawQuad(DrawingFrame& frame, const DrawQuad* quad)
 {
     WebTransformationMatrix quadRectMatrix;
     quadRectTransform(&quadRectMatrix, quad->quadTransform(), quad->quadRect());
-    WebTransformationMatrix contentsDeviceTransform = (frame.windowMatrix * frame.projectionMatrix * quadRectMatrix).to2dTransform();
+    WebTransformationMatrix deviceMatrix = (frame.windowMatrix * frame.projectionMatrix * quadRectMatrix).to2dTransform();
     SkMatrix skDeviceMatrix;
-    toSkMatrix(&skDeviceMatrix, contentsDeviceTransform);
+    toSkMatrix(&skDeviceMatrix, deviceMatrix);
     m_skCurrentCanvas->setMatrix(skDeviceMatrix);
 
     m_skCurrentPaint.reset();
@@ -258,7 +258,6 @@ void SoftwareRenderer::drawTextureQuad(const DrawingFrame& frame, const TextureD
     const SkBitmap* bitmap = lock.skBitmap();
     gfx::RectF uvRect = gfx::ScaleRect(quad->uvRect(), bitmap->width(), bitmap->height());
     SkRect skUvRect = toSkRect(uvRect);
-
     if (quad->flipped())
         m_skCurrentCanvas->scale(1, -1);
     m_skCurrentCanvas->drawBitmapRectToRect(*bitmap, &skUvRect,