[ResizeObserver] The initial value of the last reported size should b…

…e -1x-1

https://bugs.webkit.org/show_bug.cgi?id=250836

Reviewed by NOBODY (OOPS!).

The conclusion of [1] indicates that when first observing an element with ResizeObserver,
lastReportedSize gets initialized with a -1 x -1 size.

[1] w3c/csswg-drafts#3664

* LayoutTests/imported/w3c/web-platform-tests/resize-observer/notify-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/resize-observer/observe-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/resize-observer/svg-expected.txt:
* LayoutTests/platform/mac-wk1/imported/w3c/web-platform-tests/resize-observer/notify-expected.txt: Copied from LayoutTests/imported/w3c/web-platform-tests/resize-observer/notify-expected.txt.
* LayoutTests/platform/mac/imported/w3c/web-platform-tests/resize-observer/svg-expected.txt:
* Source/WebCore/page/ResizeObservation.cpp:

LayoutTests/imported/w3c/web-platform-tests/resize-observer/notify-expected.txt

@@ -2,17 +2,22 @@ ResizeObserver tests
 
 t1
 t2
-t3 inline
-
-Harness Error (TIMEOUT), message = null
+t3
+inline
 
 PASS ResizeObserver implemented
-NOTRUN guard
+PASS guard
 PASS test0: notification ordering
 PASS test1: display:none triggers notification
 PASS test2: remove/appendChild trigger notification
 PASS test3: dimensions match
 PASS test4: transform do not cause notifications
 PASS test5: moving an element does not trigger notifications
-FAIL test6: inline element notifies once with 0x0. assert_unreached: Timed out waiting for notification. (1000ms) Reached unreachable code
+PASS test6: inline element notifies once with 0x0.
+PASS test7: unobserve inside notify callback
+PASS test8: observe inside notify callback
+PASS test9: disconnect inside notify callback
+PASS test10: element notifies when parent removed
+PASS test11: display:none element should be notified
+PASS test12: element sized 0x0 should be notified
 

LayoutTests/imported/w3c/web-platform-tests/resize-observer/observe-expected.txt

@@ -19,7 +19,7 @@ PASS test12: no observation is fired after the change of writing mode when box's
 PASS test13: an observation is fired after the change of writing mode when box's specified size comes from physical size properties.
 PASS test14: observe the same target but using a different box should override the previous one
 PASS test15: an observation is fired with box dimensions 0 when element's display property is set to inline
-FAIL test16: observations fire once with 0x0 size for non-replaced inline elements assert_unreached: Timed out waiting for notification. (1000ms) Reached unreachable code
+PASS test16: observations fire once with 0x0 size for non-replaced inline elements
 PASS test17: Box sizing snd Resize Observer notifications
 FAIL test18: an observation is fired when device-pixel-content-box is being observed assert_unreached: Caught a throw, possible syntax error Reached unreachable code
 

LayoutTests/imported/w3c/web-platform-tests/resize-observer/svg-expected.txt

@@ -19,5 +19,10 @@ PASS test7: observe svg:polyline
 PASS test8: observe svg:rect
 PASS test9: observe svg:text
 PASS test10: observe svg:svg, top/left is 0 even with padding
-FAIL test11: observe svg non-displayable element assert_unreached: Timed out waiting for notification. (1000ms) Reached unreachable code
+PASS test11: observe svg non-displayable element
+PASS test12: observe svg:rect content box
+PASS test13: observe svg:rect border box
+PASS test14: observe g:rect content and border box
+PASS test15: observe svg:text content and border box
+FAIL test16: observe g:rect content, border and device-pixel-content boxes assert_unreached: Caught a throw, possible syntax error Reached unreachable code
 

LayoutTests/platform/mac-wk1/imported/w3c/web-platform-tests/resize-observer/notify-expected.txt

@@ -0,0 +1,23 @@
+ResizeObserver tests
+
+t1
+t2
+t3
+inline
+
+PASS ResizeObserver implemented
+PASS guard
+PASS test0: notification ordering
+PASS test1: display:none triggers notification
+PASS test2: remove/appendChild trigger notification
+PASS test3: dimensions match
+PASS test4: transform do not cause notifications
+PASS test5: moving an element does not trigger notifications
+FAIL test6: inline element notifies once with 0x0. assert_unreached: Timed out waiting for notification. (1000ms) Reached unreachable code
+PASS test7: unobserve inside notify callback
+PASS test8: observe inside notify callback
+PASS test9: disconnect inside notify callback
+PASS test10: element notifies when parent removed
+PASS test11: display:none element should be notified
+PASS test12: element sized 0x0 should be notified
+

LayoutTests/platform/mac/imported/w3c/web-platform-tests/resize-observer/svg-expected.txt

@@ -19,5 +19,10 @@ PASS test7: observe svg:polyline
 PASS test8: observe svg:rect
 PASS test9: observe svg:text
 PASS test10: observe svg:svg, top/left is 0 even with padding
-FAIL test11: observe svg non-displayable element assert_unreached: Timed out waiting for notification. (1000ms) Reached unreachable code
+PASS test11: observe svg non-displayable element
+PASS test12: observe svg:rect content box
+PASS test13: observe svg:rect border box
+PASS test14: observe g:rect content and border box
+FAIL test15: observe svg:text content and border box assert_equals: expected 30 but got 30.015625
+FAIL test16: observe g:rect content, border and device-pixel-content boxes assert_unreached: Caught a throw, possible syntax error Reached unreachable code
 

Source/WebCore/page/ResizeObservation.cpp

@@ -41,6 +41,7 @@ Ref<ResizeObservation> ResizeObservation::create(Element& target, ResizeObserver
 
 ResizeObservation::ResizeObservation(Element& element, ResizeObserverBoxOptions observedBox)
     : m_target { element }
+    , m_lastObservationSizes { LayoutSize(-1, -1), LayoutSize(-1, -1), LayoutSize(-1, -1) }
     , m_observedBox { observedBox }
 {
 }