Adds scroll position/scale emulation to DevTools.

third_party/WebKit/Source/web/InspectorEmulationAgent.h

Index: third_party/WebKit/Source/web/InspectorEmulationAgent.h
diff --git a/third_party/WebKit/Source/web/InspectorEmulationAgent.h b/third_party/WebKit/Source/web/InspectorEmulationAgent.h
index 40baa977d1aab11b11e0add7fc2920727b0609e5..38f01392b9e5cba2742bc2ed2e15afa756139bad 100644
--- a/third_party/WebKit/Source/web/InspectorEmulationAgent.h
+++ b/third_party/WebKit/Source/web/InspectorEmulationAgent.h
@@ -27,6 +27,8 @@ public:
     ~InspectorEmulationAgent() override;
 
     // protocol::Dispatcher::EmulationCommandHandler implementation.
+    void setScrollAndScaleOverride(ErrorString*, const Maybe<int>& scrollPositionX, const Maybe<int>& scrollPositionY, const Maybe<double>& visualViewportPositionX, const Maybe<double>& visualViewportPositionY, const Maybe<double>& visualViewportScale) override;
+    void clearScrollAndScaleOverride(ErrorString*) override;
     void resetPageScaleFactor(ErrorString*) override;
     void setPageScaleFactor(ErrorString*, double in_pageScaleFactor) override;
     void setScriptExecutionDisabled(ErrorString*, bool in_value) override;
@@ -45,6 +47,8 @@ private:
     InspectorEmulationAgent(WebLocalFrameImpl*, Client*);
     WebViewImpl* webViewImpl();
 
+    void setScrollAndScaleOverride(int framePositionX, int framePositionY, double visualViewportPositionX, double visualViewportPositionY, double pageScale);
+
     Member<WebLocalFrameImpl> m_webLocalFrameImpl;
     Client* m_client;
 };