[DevTools] Add test for viewport invalidation on resize with emulation enabled.

Source/web/tests/WebFrameTest.cpp

Index: Source/web/tests/WebFrameTest.cpp
diff --git a/Source/web/tests/WebFrameTest.cpp b/Source/web/tests/WebFrameTest.cpp
index ce479e49f729517d372f2f70f8744fa037ccabd4..d08fd605676aab61fcc0be89b0fdcca106bee359 100644
--- a/Source/web/tests/WebFrameTest.cpp
+++ b/Source/web/tests/WebFrameTest.cpp
@@ -97,6 +97,7 @@
 #include "public/web/WebCache.h"
 #include "public/web/WebConsoleMessage.h"
 #include "public/web/WebDataSource.h"
+#include "public/web/WebDeviceEmulationParams.h"
 #include "public/web/WebDocument.h"
 #include "public/web/WebFindOptions.h"
 #include "public/web/WebFormElement.h"
@@ -7732,6 +7733,57 @@ TEST_P(ParameterizedWebFrameTest, CrossDomainAccessErrorsUseCallingWindow)
     popupWebViewHelper.reset();
 }
 
+class ViewportOnResizeTest : public ParameterizedWebFrameTest {
+protected:
+    ViewportOnResizeTest()
+        : m_webViewHelper(this)
+    {
+        registerMockedHttpURLLoad("viewport_emulation.html");
+        m_client.m_screenInfo.deviceScaleFactor = 1;
+        m_webViewHelper.initializeAndLoad(m_baseURL + "viewport_emulation.html", true, 0, &m_client);
+    }
+
+    void testResize(const WebSize size, const String& expectedSize)
+    {
+        m_client.m_screenInfo.rect = WebRect(0, 0, size.width, size.height);
+        m_client.m_screenInfo.availableRect = m_client.m_screenInfo.rect;
+        m_webViewHelper.webView()->resize(size);
+        m_webViewHelper.webView()->layout();
+
+        v8::HandleScope scope(v8::Isolate::GetCurrent());
+        ScriptExecutionCallbackHelper callbackHelper(m_webViewHelper.webView()->mainFrame()->mainWorldScriptContext());
+        m_webViewHelper.webView()->mainFrame()->toWebLocalFrame()->requestExecuteScriptAndReturnValue(WebScriptSource(WebString("dumpSize()")), false, &callbackHelper);
+        runPendingTasks();
+        EXPECT_TRUE(callbackHelper.didComplete());
+        EXPECT_EQ(expectedSize, callbackHelper.stringValue());
+    }
+
+    FixedLayoutTestWebViewClient m_client;
+    FrameTestHelpers::WebViewHelper m_webViewHelper;
+};
+
+INSTANTIATE_TEST_CASE_P(All, ViewportOnResizeTest, ::testing::Values(
+    ParameterizedWebFrameTestConfig::Default,
+    ParameterizedWebFrameTestConfig::RootLayerScrolls));
+
+TEST_P(ViewportOnResizeTest, ViewportInvalidatedOnResizeWithEmulation)
+{
+    WebDeviceEmulationParams params;
+    params.screenPosition = WebDeviceEmulationParams::Mobile;
+    m_webViewHelper.webView()->enableDeviceEmulation(params);
+
+    testResize(WebSize(700, 500), "300x300");
+    testResize(WebSize(710, 500), "400x300");
+    testResize(WebSize(690, 500), "200x300");
+    testResize(WebSize(700, 510), "300x400");
+    testResize(WebSize(700, 490), "300x200");
+    testResize(WebSize(710, 510), "400x400");
+    testResize(WebSize(690, 490), "200x200");
+    testResize(WebSize(800, 600), "400x400");
+
+    m_webViewHelper.webView()->disableDeviceEmulation();
+}
+
 class WebLocalFrameScope final {
 public:
     WebLocalFrameScope(WebLocalFrame* localFrame)