Adds DevTools commands for forced viewport override.

third_party/WebKit/Source/web/InspectorEmulationAgent.cpp

 // Copyright 2015 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 "web/InspectorEmulationAgent.h"
 
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/Settings.h"
 #include "core/page/Page.h"
 #include "platform/geometry/DoubleRect.h"
 #include "public/platform/Platform.h"
+#include "public/platform/WebFloatPoint.h"
 #include "public/platform/WebThread.h"
 #include "public/platform/WebViewScheduler.h"
 #include "web/DevToolsEmulator.h"
 #include "web/WebLocalFrameImpl.h"
 #include "web/WebViewImpl.h"
 
 namespace blink {
 
 namespace EmulationAgentState {
 static const char scriptExecutionDisabled[] = "scriptExecutionDisabled";
@@ skipping 31 matching lines @@
     m_state->getString(EmulationAgentState::emulatedMedia, &emulatedMedia);
     setEmulatedMedia(&error, emulatedMedia);
 }
 
 void InspectorEmulationAgent::disable(ErrorString*)
 {
     ErrorString error;
     setScriptExecutionDisabled(&error, false);
     setTouchEmulationEnabled(&error, false, protocol::Maybe<String>());
     setEmulatedMedia(&error, String());
+    resetViewport(&error);
+}
+
+void InspectorEmulationAgent::forceViewport(ErrorString* error, double x, double y, const Maybe<double>& scale)
+{
+    if (x < 0 || y < 0) {
+        *error = "Coordinates must be non-negative";
+        return;
+    }
+
+    float appliedScale = scale.fromMaybe(1.f);
+    if (appliedScale <= 0) {
+        *error = "Scale must be positive";
+        return;
+    }
+
+    WebFloatPoint position(x, y);
+    webViewImpl()->devToolsEmulator()->forceViewport(position, appliedScale);

[dgozman, 2016/08/29 20:45:36]

We should store the values in |m_state| and restore from them in |restore()|.
This ensures we preserve the values upon cross-process navigation.

[Eric Seckler, 2016/09/12 13:58:00]

Done.

+}
+
+void InspectorEmulationAgent::resetViewport(ErrorString*)
+{
+    webViewImpl()->devToolsEmulator()->resetViewport();
 }
 
 void InspectorEmulationAgent::resetPageScaleFactor(ErrorString*)
 {
     webViewImpl()->resetScaleStateImmediately();
 }
 
 void InspectorEmulationAgent::setPageScaleFactor(ErrorString*, double pageScaleFactor)
 {
     webViewImpl()->setPageScaleFactor(static_cast<float>(pageScaleFactor));
@@ skipping 46 matching lines @@
     frontend()->virtualTimeBudgetExpired();
 }
 
 DEFINE_TRACE(InspectorEmulationAgent)
 {
     visitor->trace(m_webLocalFrameImpl);
     InspectorBaseAgent::trace(visitor);
 }
 
 } // namespace blink