[IndexedDB] Add request property to IDBCursor

https://w3c.github.io/IndexedDB/#dom-idbcursor-request

Chrome status:
https://chromestatus.com/feature/5432744081358848

Intent to Implement and Ship:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/o6mUiI09BUc/25khjTHYAAAJ

Bug: 943344
Change-Id: I9c7c801ae266c0dd75cd9bc21355913865ecbcc8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1585892
Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656396}

third_party/blink/renderer/modules/indexeddb/idb_cursor.h

@@ -72,6 +72,7 @@ class IDBCursor : public ScriptWrappable {
   ScriptValue key(ScriptState*);
   ScriptValue primaryKey(ScriptState*);
   ScriptValue value(ScriptState*);
+  IDBRequest* request() { return request_.Get(); }
   void source(Source&) const;
 
   IDBRequest* update(ScriptState*, const ScriptValue&, ExceptionState&);

third_party/blink/renderer/modules/indexeddb/idb_cursor.idl

@@ -41,6 +41,7 @@ enum IDBCursorDirection {
     readonly attribute IDBCursorDirection direction;
     [CallWith=ScriptState, CachedAttribute=isKeyDirty] readonly attribute any key;
     [CallWith=ScriptState, CachedAttribute=isPrimaryKeyDirty] readonly attribute any primaryKey;
+    [SameObject] readonly attribute IDBRequest request;
 
     [RaisesException] void advance([EnforceRange] unsigned long count);
     [CallWith=ScriptState, ImplementedAs=Continue, RaisesException] void continue([DefaultValue=Undefined] optional any key);

third_party/blink/web_tests/external/wpt/IndexedDB/idbcursor-request.any-expected.txt

-This is a testharness.js-based test.
-FAIL cursor.request from IDBObjectStore.openCursor assert_equals: cursor.request expected (object) object "[object IDBRequest]" but got (undefined) undefined
-FAIL cursor.request from IDBObjectStore.openKeyCursor assert_equals: cursor.request expected (object) object "[object IDBRequest]" but got (undefined) undefined
-FAIL cursor.request from IDBIndex.openCursor assert_equals: cursor.request expected (object) object "[object IDBRequest]" but got (undefined) undefined
-FAIL cursor.request from IDBIndex.openKeyCursor assert_equals: cursor.request expected (object) object "[object IDBRequest]" but got (undefined) undefined
-Harness: the test ran to completion.
-

third_party/blink/web_tests/external/wpt/IndexedDB/idbcursor-request.any.js

@@ -18,6 +18,7 @@ function cursorRequestTest({ useIndex, useKeyCursor }) {
         cursor = req.result;
         assert_equals(cursor.request, req, 'cursor.request');
         assert_readonly(cursor, 'request');
+        assert_equals(cursor.request, cursor.request, 'cursor.request does not change');
       });
 
       req.transaction.oncomplete = t.step_func(() => {

third_party/blink/web_tests/external/wpt/IndexedDB/idbcursor-request.any.worker-expected.txt

-This is a testharness.js-based test.
-FAIL cursor.request from IDBObjectStore.openCursor assert_equals: cursor.request expected (object) object "[object IDBRequest]" but got (undefined) undefined
-FAIL cursor.request from IDBObjectStore.openKeyCursor assert_equals: cursor.request expected (object) object "[object IDBRequest]" but got (undefined) undefined
-FAIL cursor.request from IDBIndex.openCursor assert_equals: cursor.request expected (object) object "[object IDBRequest]" but got (undefined) undefined
-FAIL cursor.request from IDBIndex.openKeyCursor assert_equals: cursor.request expected (object) object "[object IDBRequest]" but got (undefined) undefined
-Harness: the test ran to completion.
-

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

@@ -549,6 +549,7 @@ interface IDBCursor
     getter direction
     getter key
     getter primaryKey
+    getter request
     getter source
     method advance
     method constructor

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

@@ -526,6 +526,7 @@ interface IDBCursor
     getter direction
     getter key
     getter primaryKey
+    getter request
     getter source
     method advance
     method constructor

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

@@ -487,6 +487,7 @@ Starting worker: resources/global-interface-listing-worker.js
 [Worker]     getter direction
 [Worker]     getter key
 [Worker]     getter primaryKey
+[Worker]     getter request
 [Worker]     getter source
 [Worker]     method advance
 [Worker]     method constructor

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

@@ -3455,6 +3455,7 @@ interface IDBCursor
     getter direction
     getter key
     getter primaryKey
+    getter request
     getter source
     method advance
     method constructor

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

@@ -482,6 +482,7 @@ Starting worker: resources/global-interface-listing-worker.js
 [Worker]     getter direction
 [Worker]     getter key
 [Worker]     getter primaryKey
+[Worker]     getter request
 [Worker]     getter source
 [Worker]     method advance
 [Worker]     method constructor

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

@@ -496,6 +496,7 @@ Starting worker: resources/global-interface-listing-worker.js
 [Worker]     getter direction
 [Worker]     getter key
 [Worker]     getter primaryKey
+[Worker]     getter request
 [Worker]     getter source
 [Worker]     method advance
 [Worker]     method constructor

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

@@ -4044,6 +4044,7 @@ interface IDBCursor
     getter direction
     getter key
     getter primaryKey
+    getter request
     getter source
     method advance
     method constructor

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

@@ -491,6 +491,7 @@ Starting worker: resources/global-interface-listing-worker.js
 [Worker]     getter direction
 [Worker]     getter key
 [Worker]     getter primaryKey
+[Worker]     getter request
 [Worker]     getter source
 [Worker]     method advance
 [Worker]     method constructor