Add WebElement::isEditable.

Source/web/WebElementTest.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "public/web/WebElement.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/shadow/ShadowRoot.h"
@@ skipping 61 matching lines @@
     OwnPtr<DummyPageHolder> m_pageHolder;
 };
 
 void WebElementTest::insertHTML(String html)
 {
     document().documentElement()->setInnerHTML(html, ASSERT_NO_EXCEPTION);
 }
 
 WebElement WebElementTest::testElement()
 {
-    return WebElement(document().getElementById("testElement"));
+    Element* element = document().getElementById("testElement");
+    ASSERT(element);
+    return WebElement(element);
 }
 
 void WebElementTest::SetUp()
 {
     m_pageHolder = DummyPageHolder::create(IntSize(800, 600));
 }
 
 TEST_F(WebElementTest, HasNonEmptyLayoutSize)
 {
     insertHTML(s_emptyBlock);
@@ skipping 19 matching lines @@
 
     insertHTML(s_blockWithText);
     EXPECT_TRUE(testElement().hasNonEmptyLayoutSize());
 
     insertHTML(s_emptyBlock);
     RefPtrWillBeRawPtr<ShadowRoot> root = document().getElementById("testElement")->createShadowRootInternal(ShadowRootType::OpenByDefault, ASSERT_NO_EXCEPTION);
     root->setInnerHTML("<div>Hello World</div>", ASSERT_NO_EXCEPTION);
     EXPECT_TRUE(testElement().hasNonEmptyLayoutSize());
 }
 
+TEST_F(WebElementTest, IsEditable)
+{
+    insertHTML("<div id=testElement></div>");
+    EXPECT_FALSE(testElement().isEditable());
+
+    insertHTML("<div id=testElement contenteditable=true></div>");
+    EXPECT_TRUE(testElement().isEditable());
+
+    insertHTML(
+        "<div style='-webkit-user-modify: read-write'>"
+        "  <div id=testElement></div>"
+        "</div>"
+    );
+    EXPECT_TRUE(testElement().isEditable());
+
+    insertHTML(
+        "<div style='-webkit-user-modify: read-write'>"
+        "  <div id=testElement style='-webkit-user-modify: read-only'></div>"
+        "</div>"
+    );
+    EXPECT_FALSE(testElement().isEditable());
+
+    insertHTML("<input id=testElement>");
+    EXPECT_TRUE(testElement().isEditable());
+
+    insertHTML("<input id=testElement readonly>");
+    EXPECT_FALSE(testElement().isEditable());
+
+    insertHTML("<input id=testElement disabled>");
+    EXPECT_FALSE(testElement().isEditable());
+
+    insertHTML("<fieldset disabled><div><input id=testElement></div></fieldset>");
+    EXPECT_FALSE(testElement().isEditable());
+}
+
 } // namespace blink