Remove the composited path from WebViewImpl::paint().

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 90bff6f0536702e25d0670449c62686e45dc75f6..305c8abd2db597945ae42fe33508778f602ca839 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -1746,63 +1746,18 @@ void WebViewImpl::enterForceCompositingMode(bool enter)
     }
 }
 
-void WebViewImpl::doPixelReadbackToCanvas(WebCanvas* canvas, const IntRect& rect)
+void WebViewImpl::paint(WebCanvas* canvas, const WebRect& rect)
 {
-    ASSERT(m_layerTreeView);
-
-    SkBitmap target;
-    target.setConfig(SkImageInfo::MakeN32Premul(rect.width(), rect.height()), rect.width() * 4);
-    if (!target.allocPixels())
-        return;
-    m_layerTreeView->compositeAndReadback(target.getPixels(), rect);
-#if (!SK_R32_SHIFT && SK_B32_SHIFT == 16)
-    // The compositor readback always gives back pixels in BGRA order, but for
-    // example Android's Skia uses RGBA ordering so the red and blue channels
-    // need to be swapped.
-    uint8_t* pixels = reinterpret_cast<uint8_t*>(target.getPixels());
-    for (size_t i = 0; i < target.getSize(); i += 4)
-        std::swap(pixels[i], pixels[i + 2]);
-#endif
-    canvas->writePixels(target, rect.x(), rect.y());
-}
-
-void WebViewImpl::paint(WebCanvas* canvas, const WebRect& rect, PaintOptions option)
-{
-#if !OS(ANDROID)
-    // ReadbackFromCompositorIfAvailable is the only option available on non-Android.
-    // Ideally, Android would always use ReadbackFromCompositorIfAvailable as well.
-    ASSERT(option == ReadbackFromCompositorIfAvailable);
-#endif
-
-    if (option == ReadbackFromCompositorIfAvailable && isAcceleratedCompositingActive()) {
-        // If a canvas was passed in, we use it to grab a copy of the
-        // freshly-rendered pixels.
-        if (canvas) {
-            // Clip rect to the confines of the rootLayerTexture.
-            IntRect resizeRect(rect);
-            resizeRect.intersect(IntRect(IntPoint(0, 0), m_layerTreeView->deviceViewportSize()));
-            doPixelReadbackToCanvas(canvas, resizeRect);
-        }
-    } else {
-        FrameView* view = page()->mainFrame()->view();
-        PaintBehavior oldPaintBehavior = view->paintBehavior();
-        if (isAcceleratedCompositingActive()) {
-            ASSERT(option == ForceSoftwareRenderingAndIgnoreGPUResidentContent);
-            view->setPaintBehavior(oldPaintBehavior | PaintBehaviorFlattenCompositingLayers);
-        }
-
-        double paintStart = currentTime();
-        PageWidgetDelegate::paint(m_page.get(), pageOverlays(), canvas, rect, isTransparent() ? PageWidgetDelegate::Translucent : PageWidgetDelegate::Opaque);
-        double paintEnd = currentTime();
-        double pixelsPerSec = (rect.width * rect.height) / (paintEnd - paintStart);
-        blink::Platform::current()->histogramCustomCounts("Renderer4.SoftwarePaintDurationMS", (paintEnd - paintStart) * 1000, 0, 120, 30);
-        blink::Platform::current()->histogramCustomCounts("Renderer4.SoftwarePaintMegapixPerSecond", pixelsPerSec / 1000000, 10, 210, 30);
+    // This should only be used when compositing is not being used for this
+    // WebView, and it is painting into the recording of its parent.
+    ASSERT(!isAcceleratedCompositingActive());
 
-        if (isAcceleratedCompositingActive()) {
-            ASSERT(option == ForceSoftwareRenderingAndIgnoreGPUResidentContent);
-            view->setPaintBehavior(oldPaintBehavior);
-        }
-    }
+    double paintStart = currentTime();
+    PageWidgetDelegate::paint(m_page.get(), pageOverlays(), canvas, rect, isTransparent() ? PageWidgetDelegate::Translucent : PageWidgetDelegate::Opaque);
+    double paintEnd = currentTime();
+    double pixelsPerSec = (rect.width * rect.height) / (paintEnd - paintStart);
+    blink::Platform::current()->histogramCustomCounts("Renderer4.SoftwarePaintDurationMS", (paintEnd - paintStart) * 1000, 0, 120, 30);
+    blink::Platform::current()->histogramCustomCounts("Renderer4.SoftwarePaintMegapixPerSecond", pixelsPerSec / 1000000, 10, 210, 30);
 }
 
 #if OS(ANDROID)