Launch fontBoundingBoxAscent/Descent

This change removes the flag ExtendedTextMetrics.fontBoundingBoxAscent
and Descent and references in code to ship attributes in TextMetrics:
fontBoundingBoxAscent and fontBoundingBoxDescent.
Currently chrome is only returning the width,
actualBoundingBoxLeft/Right/Ascent/Descent of the measured text.
https://html.spec.whatwg.org/multipage/canvas.html#textmetrics

Intend-to-ship:
https://groups.google.com/a/chromium.org/g/blink-dev/c/GSmWjdqmgCA/m/c5Y8DfKyCAAJ

Bug: 1129621

Change-Id: Id367f0f8d74aa82f6baa64f5909b325fede57b60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440847
Commit-Queue: Yi Xu <yiyix@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812728}

third_party/blink/renderer/core/html/canvas/text_metrics.idl

@@ -34,8 +34,8 @@ interface TextMetrics {
     readonly attribute double actualBoundingBoxRight;
 
     // y-direction
-    [RuntimeEnabled=ExtendedTextMetrics] readonly attribute double fontBoundingBoxAscent;
-    [RuntimeEnabled=ExtendedTextMetrics] readonly attribute double fontBoundingBoxDescent;
+    readonly attribute double fontBoundingBoxAscent;
+    readonly attribute double fontBoundingBoxDescent;
     readonly attribute double actualBoundingBoxAscent;
     readonly attribute double actualBoundingBoxDescent;
     [RuntimeEnabled=ExtendedTextMetrics] readonly attribute double emHeightAscent;

third_party/blink/web_tests/external/wpt/workers/semantics/interface-objects/004.any.js

@@ -11,7 +11,6 @@ var unexpected = [
   "Audio",
   "HTMLCanvasElement",
   "Path",
-  "TextMetrics",
   "CanvasProxy",
   "CanvasRenderingContext2D",
   "DrawingStyle",

third_party/blink/web_tests/external/wpt/workers/semantics/interface-objects/004.any.sharedworker-expected.txt

@@ -8,7 +8,6 @@ PASS The DOMImplementation interface object should not be exposed
 PASS The Audio interface object should not be exposed
 PASS The HTMLCanvasElement interface object should not be exposed
 PASS The Path interface object should not be exposed
-FAIL The TextMetrics interface object should not be exposed assert_false: expected false got true
 PASS The CanvasProxy interface object should not be exposed
 PASS The CanvasRenderingContext2D interface object should not be exposed
 PASS The DrawingStyle interface object should not be exposed

third_party/blink/web_tests/virtual/stable/http/tests/serviceworker/webexposed/global-interface-listing-service-worker-expected.txt

@@ -1284,6 +1284,8 @@ interface TextMetrics
     getter actualBoundingBoxDescent
     getter actualBoundingBoxLeft
     getter actualBoundingBoxRight
+    getter fontBoundingBoxAscent
+    getter fontBoundingBoxDescent
     getter width
     method constructor
 interface TransformStream

third_party/blink/web_tests/virtual/stable/webexposed/global-interface-listing-dedicated-worker-expected.txt

@@ -1172,6 +1172,8 @@ Starting worker: resources/global-interface-listing-worker.js
 [Worker]     getter actualBoundingBoxDescent
 [Worker]     getter actualBoundingBoxLeft
 [Worker]     getter actualBoundingBoxRight
+[Worker]     getter fontBoundingBoxAscent
+[Worker]     getter fontBoundingBoxDescent
 [Worker]     getter width
 [Worker]     method constructor
 [Worker] interface TransformStream

third_party/blink/web_tests/virtual/stable/webexposed/global-interface-listing-expected.txt

@@ -7281,6 +7281,8 @@ interface TextMetrics
     getter actualBoundingBoxDescent
     getter actualBoundingBoxLeft
     getter actualBoundingBoxRight
+    getter fontBoundingBoxAscent
+    getter fontBoundingBoxDescent
     getter width
     method constructor
 interface TextTrack : EventTarget

third_party/blink/web_tests/virtual/stable/webexposed/global-interface-listing-shared-worker-expected.txt

@@ -1172,6 +1172,8 @@ Starting worker: resources/global-interface-listing-worker.js
 [Worker]     getter actualBoundingBoxDescent
 [Worker]     getter actualBoundingBoxLeft
 [Worker]     getter actualBoundingBoxRight
+[Worker]     getter fontBoundingBoxAscent
+[Worker]     getter fontBoundingBoxDescent
 [Worker]     getter width
 [Worker]     method constructor
 [Worker] interface TransformStream