Compute effective touch action in StyleAdjuster.

third_party/WebKit/Source/core/layout/LayoutIFrameTest.cpp

+// Copyright 2017 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 "core/layout/LayoutIFrame.h"
+#include "core/layout/LayoutTestHelper.h"
+#include "core/layout/LayoutView.h"
+#include "platform/testing/RuntimeEnabledFeaturesTestHelpers.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+class LayoutIFrameTest : public RenderingTest {
+ public:
+  LayoutIFrameTest() : RenderingTest(SingleChildLocalFrameClient::Create()) {}
+};
+
+TEST_F(LayoutIFrameTest, TouchActionPropagatedAcrossIframes) {

[flackr, 2017/06/21 15:24:34]

Can you make this part of StyleAdjusterTest to keep it with the code it is
testing?

[sunxd, 2017/06/22 17:22:55]

Done.

+  GetDocument().SetBaseURLOverride(KURL(kParsedURLString, "http://test.com"));
+  SetBodyInnerHTML(
+      "<style>body { margin: 0; } iframe { display: block; } </style>"
+      "<iframe id='owner' src='http://test.com' width='500' height='500' "
+      "style='touch-action: none'>"
+      "</iframe>");
+  SetChildFrameHTML(
+      "<style>body { margin: 0; } #target { width: 200px; height: 200px; } "
+      "</style>"
+      "<div id='target' style='touch-action: pinch-zoom'></div>");
+  GetDocument().View()->UpdateAllLifecyclePhases();
+
+  Element* target = ChildDocument().getElementById("target");
+  ASSERT_TRUE(target && target->GetComputedStyle());
+  EXPECT_EQ(TouchAction::kTouchActionNone,
+            target->GetComputedStyle()->GetEffectiveTouchAction());
+
+  Element* owner = GetDocument().getElementById("owner");
+  ASSERT_TRUE(owner);
+  owner->setAttribute(HTMLNames::styleAttr, "touch-action: auto");
+  GetDocument().View()->UpdateAllLifecyclePhases();
+  EXPECT_EQ(TouchAction::kTouchActionPinchZoom,
+            target->GetComputedStyle()->GetEffectiveTouchAction());
+}
+
+}  // namespace blink