ui: Use a PaintRecorder to access the Canvas for painting.

ui/aura/window_unittest.cc

Index: ui/aura/window_unittest.cc
diff --git a/ui/aura/window_unittest.cc b/ui/aura/window_unittest.cc
index c7a06292726ff214e801c7beafb1977029b80a88..0643cc22772f907088da166b15dc1934319004e1 100644
--- a/ui/aura/window_unittest.cc
+++ b/ui/aura/window_unittest.cc
@@ -31,7 +31,6 @@
 #include "ui/base/hit_test.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_animation_observer.h"
-#include "ui/compositor/paint_context.h"
 #include "ui/compositor/scoped_animation_duration_scale_mode.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/compositor/test/test_layers.h"
@@ -2841,47 +2840,6 @@ TEST_F(WindowTest, OnWindowHierarchyChange) {
 
 namespace {
 
-// Tracks the number of times paint is invoked along with what the clip and
-// translate was.
-class PaintWindowDelegate : public TestWindowDelegate {
- public:
-  PaintWindowDelegate() : paint_count_(0) {}
-  ~PaintWindowDelegate() override {}
-
-  const gfx::Rect& most_recent_paint_clip_bounds() const {
-    return most_recent_paint_clip_bounds_;
-  }
-
-  const gfx::Vector2d& most_recent_paint_matrix_offset() const {
-    return most_recent_paint_matrix_offset_;
-  }
-
-  void clear_paint_count() { paint_count_ = 0; }
-  int paint_count() const { return paint_count_; }
-
-  // TestWindowDelegate::
-  void OnPaint(const ui::PaintContext& context) override {
-    gfx::Canvas* canvas = context.canvas();
-    paint_count_++;
-    canvas->GetClipBounds(&most_recent_paint_clip_bounds_);
-    const SkMatrix& matrix = canvas->sk_canvas()->getTotalMatrix();
-    most_recent_paint_matrix_offset_ = gfx::Vector2d(
-        SkScalarFloorToInt(matrix.getTranslateX()),
-        SkScalarFloorToInt(matrix.getTranslateY()));
-  }
-
- private:
-  int paint_count_;
-  gfx::Rect most_recent_paint_clip_bounds_;
-  gfx::Vector2d most_recent_paint_matrix_offset_;
-
-  DISALLOW_COPY_AND_ASSIGN(PaintWindowDelegate);
-};
-
-}  // namespace
-
-namespace {
-
 class TestLayerAnimationObserver : public ui::LayerAnimationObserver {
  public:
   TestLayerAnimationObserver()