Fix PointerEventManager::HandleResizerDrag

PointerEventManager::HandleResizerDrag should use the frame of
the hittest result not frame_.

This is the final fix needed to get the web_test
fast/scrolling/resize-iframe-corner-tracking-touch.html passing.

Bug: 1248581
Change-Id: I4cc7fa81f093dbf9fd5bd89a1ce7e3736ffd647f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4021410
Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: Mustaq Ahmed <mustaq@chromium.org>
Commit-Queue: David Awogbemila <awogbemila@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1075190}

third_party/blink/renderer/core/input/pointer_event_manager.cc

@@ -768,9 +768,9 @@ bool PointerEventManager::HandleResizerDrag(
       if (!layer->GetScrollableArea())
         return false;
 
-      gfx::Point p = frame_->View()->ConvertFromRootFrame(
-          gfx::ToFlooredPoint(event.PositionInWidget()));
-
+      gfx::Point p =
+          pointer_event_target.target_frame->View()->ConvertFromRootFrame(
+              gfx::ToFlooredPoint(event.PositionInWidget()));
       if (layer->GetScrollableArea()->IsAbsolutePointInResizeControl(
               p, kResizerForTouch)) {
         resize_scrollable_area_ = layer->GetScrollableArea();

third_party/blink/web_tests/TestExpectations

@@ -5893,7 +5893,6 @@ crbug.com/1311128 external/wpt/paint-timing/fcp-only/fcp-document-opacity-text.h
 
 # Scroll Unification known issues (go/su-web-tests) for enabling in test:
 crbug.com/1311431 [ Mac ] fast/scroll-behavior/overscroll-behavior.html [ Failure Pass ]
-crbug.com/1248581 fast/scrolling/resize-iframe-corner-tracking-touch.html [ Failure Pass ]
 crbug.com/1312036 virtual/hidpi/fast/scrolling/scrollbars/dsf-ready/mouse-interactions-dsf-2.html [ Failure Pass ]
 
 # These tests fail on SwiftShader FEMU due to a change in log/exp implementation.

third_party/blink/web_tests/fast/scrolling/resize-iframe-corner-tracking-touch.html

@@ -9,8 +9,8 @@
 
 </style>
 
-<iframe id="iframe1" src="resources/resize-corner-tracking-touch-iframe.html"
-        style="resize:both; width: 200px; height: 200px"></iframe>
+<iframe id="iframe1" src="resources/resize-corner-tracking-touch-child-iframe.html"
+  style="resize:both; width: 400px; height: 400px;"></iframe>
 
 <script type="text/javascript">
   async function touchDrag(target, offset, delta) {
@@ -58,7 +58,7 @@
   }
 
   async function setupTest(scrollTop = 50) {
-    resetStyle('iframe1', 'resize:both; width: 200px; height: 200px;');
+    resetStyle('iframe1', 'resize:both; width: 400px; height: 400px;');
 
     // Scroll the page first to test that resize works with a scrolled page.
     document.scrollingElement.scrollTop = scrollTop;
@@ -93,15 +93,35 @@
     promise_test(async () => {
       await setupTest(/* scrollTop */ 150);
 
-      const iframe = document.getElementById("iframe1");
-      const rect = iframe.getBoundingClientRect();
-      const target = iframe.contentDocument.getElementById("textarea2");
-      const oldBounds = target.getBoundingClientRect();
-
-      await touchDrag(target, {x: rect.left - 6, y: rect.top - 7},
-        {dx: 20, dy: 10});
-      assert_resize(target, oldBounds);
-    }, 'Touch drag inside the resizer area of a textarea inside an iframe ' +
+      const outer_iframe = document.getElementById("iframe1");
+      const outer_rect = outer_iframe.getBoundingClientRect();
+      const inner_iframe = outer_iframe.contentDocument.getElementById("inner-iframe");
+      const inner_rect = inner_iframe.getBoundingClientRect();
+      const textarea = inner_iframe.contentDocument.getElementById("textarea2");
+
+      const left_offset = outer_rect.left + inner_rect.left - 6;
+      const top_offset = outer_rect.top + inner_rect.top - 7;
+
+      const oldBounds = textarea.getBoundingClientRect();
+      await touchDrag(textarea, {x: left_offset, y: top_offset}, {dx: 20, dy: 10});
+      assert_resize(textarea, oldBounds);
+    }, 'Touch drag inside the resizer of a textarea within an iframe within another iframe ' +
     'will resize the textarea.');
+
+    promise_test(async () => {
+      await setupTest(/* scrollTop */ 150);
+
+      const outer_iframe = document.getElementById("iframe1");
+      const outer_rect = outer_iframe.getBoundingClientRect();
+      const inner_iframe = outer_iframe.contentDocument.getElementById("inner-iframe");
+
+      const left_offset = outer_rect.left - 6;
+      const top_offset = outer_rect.top - 7;
+
+      const oldBounds = inner_iframe.getBoundingClientRect();
+      await touchDrag(inner_iframe, {x: left_offset, y: top_offset}, {dx: 20, dy: 10});
+      assert_resize(inner_iframe, oldBounds);
+    }, 'Touch drag inside the resizer of an iframe within another iframe ' +
+    'will resize the inner iframe.');
   };
 </script>

third_party/blink/web_tests/fast/scrolling/resources/resize-corner-tracking-touch-child-iframe.html

@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<html>
+<body>
+<iframe id="inner-iframe" src="resize-corner-tracking-touch-grandchild-iframe.html"
+  style="resize:both; width: 200px; height: 200px;"></iframe>
+</body>
+</html>

third_party/blink/web_tests/fast/scrolling/resources/resize-corner-tracking-touch-iframe.html → third_party/blink/web_tests/fast/scrolling/resources/resize-corner-tracking-touch-grandchild-iframe.html

@@ -1,4 +1,4 @@
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
+<!DOCTYPE html>
 <html>
 <body>
     <textarea id="textarea2" style="resize:both; width: 100px; height: 100px;">hello</textarea>