[SPv175] Fix tap disambiguation popup (and perhaps other popups) painting

Previously the scale and clip operations were outputted with
TransformRecorder and ClipRecorder which were no-op on SPv175.
Change them to direct canvas operations.

Bug: 815075
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I0f31640563aa09f37e68028413a7dacbb74f506a
Reviewed-on: https://chromium-review.googlesource.com/957595Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542641}

third_party/WebKit/Source/core/page/PageWidgetDelegate.cpp

@@ -78,38 +78,31 @@ static void PaintInternal(Page& page,
   if (rect.IsEmpty())
     return;
 
-  PaintRecordBuilder builder;
-  {
-    GraphicsContext& paint_context = builder.Context();
-
   // FIXME: device scale factor settings are layering violations and should
   // not be used within Blink paint code.
   float scale_factor = page.DeviceScaleFactorDeprecated();
-    paint_context.SetDeviceScaleFactor(scale_factor);
-
-    AffineTransform scale;
-    scale.Scale(scale_factor);
-    TransformRecorder scale_recorder(paint_context, builder, scale);
+  canvas->save();
+  canvas->scale(scale_factor, scale_factor);
 
   IntRect dirty_rect(rect);
   LocalFrameView* view = root.View();
   if (view) {
     DCHECK(view->GetLayoutView()->GetDocument().Lifecycle().GetState() ==
            DocumentLifecycle::kPaintClean);
-      ClipRecorder clip_recorder(paint_context, builder,
-                                 DisplayItem::kPageWidgetDelegateClip,
-                                 dirty_rect);
-      view->PaintWithLifecycleUpdate(paint_context, global_paint_flags,
+    canvas->clipRect(dirty_rect);
+
+    PaintRecordBuilder builder;
+    builder.Context().SetDeviceScaleFactor(scale_factor);
+    view->PaintWithLifecycleUpdate(builder.Context(), global_paint_flags,
                                    CullRect(dirty_rect));
+    builder.EndRecording(*canvas);
   } else {
-      DrawingRecorder recorder(
-          paint_context, builder,
-          DisplayItem::kPageWidgetDelegateBackgroundFallback);
-      paint_context.FillRect(dirty_rect, Color::kWhite);
-    }
+    PaintFlags flags;
+    flags.setColor(SK_ColorWHITE);
+    canvas->drawRect(dirty_rect, flags);
   }
 
-  builder.EndRecording(*canvas);
+  canvas->restore();
 }
 
 void PageWidgetDelegate::Paint(Page& page,

third_party/WebKit/Source/platform/graphics/paint/DisplayItem.cpp

@@ -80,7 +80,6 @@ static WTF::String SpecialDrawingTypeAsDebugString(DisplayItem::Type type) {
     DEBUG_STRING_CASE(LinkHighlight);
     DEBUG_STRING_CASE(ImageAreaFocusRing);
     DEBUG_STRING_CASE(PageOverlay);
-    DEBUG_STRING_CASE(PageWidgetDelegateBackgroundFallback);
     DEBUG_STRING_CASE(PopupContainerBorder);
     DEBUG_STRING_CASE(PopupListBoxBackground);
     DEBUG_STRING_CASE(PopupListBoxRow);
@@ -152,7 +151,6 @@ static WTF::String ClipTypeAsDebugString(DisplayItem::Type type) {
     DEBUG_STRING_CASE(ClipPopupListBoxFrame);
     DEBUG_STRING_CASE(ClipScrollbarsToBoxBounds);
     DEBUG_STRING_CASE(ClipSelectionImage);
-    DEBUG_STRING_CASE(PageWidgetDelegateClip);
     DEFAULT_CASE;
   }
 }

third_party/WebKit/Source/platform/graphics/paint/DisplayItem.h

@@ -83,7 +83,6 @@ class PLATFORM_EXPORT DisplayItem {
     kLinkHighlight,
     kImageAreaFocusRing,
     kPageOverlay,
-    kPageWidgetDelegateBackgroundFallback,
     kPopupContainerBorder,
     kPopupListBoxBackground,
     kPopupListBoxRow,
@@ -140,8 +139,7 @@ class PLATFORM_EXPORT DisplayItem {
     kClipPopupListBoxFrame,
     kClipScrollbarsToBoxBounds,
     kClipSelectionImage,
-    kPageWidgetDelegateClip,
-    kClipLast = kPageWidgetDelegateClip,
+    kClipLast = kClipSelectionImage,
 
     kEndClipFirst,
     kEndClipLast = kEndClipFirst + kClipLast - kClipFirst,