Phase III Step 2: Call imageNotifyFinished() and image load event after SVG loading completes

third_party/WebKit/Source/core/svg/graphics/SVGImage.h

Index: third_party/WebKit/Source/core/svg/graphics/SVGImage.h
diff --git a/third_party/WebKit/Source/core/svg/graphics/SVGImage.h b/third_party/WebKit/Source/core/svg/graphics/SVGImage.h
index 46a897a883a93a9a50b6ad0184e174685204dcfe..01067ef703f33b36bd0c41c0c7d2e7d93ba1b0cf 100644
--- a/third_party/WebKit/Source/core/svg/graphics/SVGImage.h
+++ b/third_party/WebKit/Source/core/svg/graphics/SVGImage.h
@@ -183,6 +183,10 @@ class CORE_EXPORT SVGImage final : public Image {
   void ScheduleTimelineRewind();
   void FlushPendingTimelineRewind();
 
+  void LoadCompleted();
+
+  class SVGImageLocalFrameClient;
+
   Persistent<SVGImageChromeClient> chrome_client_;
   Persistent<Page> page_;
   std::unique_ptr<PaintController> paint_controller_;
@@ -194,6 +198,17 @@ class CORE_EXPORT SVGImage final : public Image {
   // the "concrete object size". For more, see: SVGImageForContainer.h
   IntSize intrinsic_size_;
   bool has_pending_timeline_rewind_;
+
+  enum LoadState {
+    kDataChangedNotStarted,
+    kInDataChanged,
+    kWaitingForAsyncLoadCompletion,
+    kLoadCompleted,
+  };
+
+  LoadState load_state_ = kDataChangedNotStarted;
+
+  Persistent<SVGImageLocalFrameClient> frame_client_;
 };
 
 DEFINE_IMAGE_TYPE_CASTS(SVGImage);