Add text autosizing override in the inspector.

Source/core/inspector/InspectorPageAgent.cpp

Index: Source/core/inspector/InspectorPageAgent.cpp
diff --git a/Source/core/inspector/InspectorPageAgent.cpp b/Source/core/inspector/InspectorPageAgent.cpp
index 3a5b287aaf58cb2f451cda2869fb6fc27dcc76f7..6961bcb362b2e072bd2893950143ba0ccfe08fc7 100644
--- a/Source/core/inspector/InspectorPageAgent.cpp
+++ b/Source/core/inspector/InspectorPageAgent.cpp
@@ -88,6 +88,7 @@ static const char pageAgentScreenHeightOverride[] = "pageAgentScreenHeightOverri
 static const char pageAgentDeviceScaleFactorOverride[] = "pageAgentDeviceScaleFactorOverride";
 static const char pageAgentFitWindow[] = "pageAgentFitWindow";
 static const char pageAgentShowFPSCounter[] = "pageAgentShowFPSCounter";
+static const char pageAgentTextAutosizingOverride[] = "pageAgentTextAutosizingOverride";
 static const char pageAgentContinuousPaintingEnabled[] = "pageAgentContinuousPaintingEnabled";
 static const char pageAgentShowPaintRects[] = "pageAgentShowPaintRects";
 static const char pageAgentShowDebugBorders[] = "pageAgentShowDebugBorders";
@@ -362,7 +363,8 @@ void InspectorPageAgent::restore()
         int currentHeight = static_cast<int>(m_state->getLong(PageAgentState::pageAgentScreenHeightOverride));
         double currentDeviceScaleFactor = m_state->getDouble(PageAgentState::pageAgentDeviceScaleFactorOverride);
         bool currentFitWindow = m_state->getBoolean(PageAgentState::pageAgentFitWindow);
-        updateViewMetrics(currentWidth, currentHeight, currentDeviceScaleFactor, currentFitWindow);
+        bool currentTextAutosizing = m_state->getBoolean(PageAgentState::pageAgentTextAutosizingOverride);
+        updateViewMetrics(currentWidth, currentHeight, currentDeviceScaleFactor, currentFitWindow, currentTextAutosizing);
         updateTouchEventEmulationInPage(m_state->getBoolean(PageAgentState::touchEventEmulationEnabled));
     }
 }
@@ -398,15 +400,16 @@ void InspectorPageAgent::disable(ErrorString*)
     if (m_didForceCompositingMode)
         setForceCompositingMode(0, false);
 
-    if (!deviceMetricsChanged(0, 0, 1, false))
+    if (!deviceMetricsChanged(0, 0, 1, false, false))
         return;
 
     // When disabling the agent, reset the override values if necessary.
-    updateViewMetrics(0, 0, 1, false);
+    updateViewMetrics(0, 0, 1, false, false);
     m_state->setLong(PageAgentState::pageAgentScreenWidthOverride, 0);
     m_state->setLong(PageAgentState::pageAgentScreenHeightOverride, 0);
     m_state->setDouble(PageAgentState::pageAgentDeviceScaleFactorOverride, 1);
     m_state->setBoolean(PageAgentState::pageAgentFitWindow, false);
+    m_state->setBoolean(PageAgentState::pageAgentTextAutosizingOverride, false);
 }
 
 void InspectorPageAgent::addScriptToEvaluateOnLoad(ErrorString*, const String& source, String* identifier)
@@ -659,7 +662,7 @@ void InspectorPageAgent::setDocumentContent(ErrorString* errorString, const Stri
     DOMPatchSupport::patchDocument(*document, html);
 }
 
-void InspectorPageAgent::setDeviceMetricsOverride(ErrorString* errorString, int width, int height, double deviceScaleFactor, bool fitWindow)
+void InspectorPageAgent::setDeviceMetricsOverride(ErrorString* errorString, int width, int height, double deviceScaleFactor, bool fitWindow, const bool* optionalTextAutosizing)
 {
     const static long maxDimension = 10000000;
 
@@ -678,26 +681,30 @@ void InspectorPageAgent::setDeviceMetricsOverride(ErrorString* errorString, int
         return;
     }
 
-    if (!deviceMetricsChanged(width, height, deviceScaleFactor, fitWindow))
+    bool textAutosizing = optionalTextAutosizing ? *optionalTextAutosizing : false;
+
+    if (!deviceMetricsChanged(width, height, deviceScaleFactor, fitWindow, textAutosizing))
         return;
 
     m_state->setLong(PageAgentState::pageAgentScreenWidthOverride, width);
     m_state->setLong(PageAgentState::pageAgentScreenHeightOverride, height);
     m_state->setDouble(PageAgentState::pageAgentDeviceScaleFactorOverride, deviceScaleFactor);
     m_state->setBoolean(PageAgentState::pageAgentFitWindow, fitWindow);
+    m_state->setBoolean(PageAgentState::pageAgentTextAutosizingOverride, textAutosizing);
 
-    updateViewMetrics(width, height, deviceScaleFactor, fitWindow);
+    updateViewMetrics(width, height, deviceScaleFactor, fitWindow, textAutosizing);
 }
 
-bool InspectorPageAgent::deviceMetricsChanged(int width, int height, double deviceScaleFactor, bool fitWindow)
+bool InspectorPageAgent::deviceMetricsChanged(int width, int height, double deviceScaleFactor, bool fitWindow, bool textAutosizing)
 {
     // These two always fit an int.
     int currentWidth = static_cast<int>(m_state->getLong(PageAgentState::pageAgentScreenWidthOverride));
     int currentHeight = static_cast<int>(m_state->getLong(PageAgentState::pageAgentScreenHeightOverride));
     double currentDeviceScaleFactor = m_state->getDouble(PageAgentState::pageAgentDeviceScaleFactorOverride, 1);
     bool currentFitWindow = m_state->getBoolean(PageAgentState::pageAgentFitWindow);
+    bool currentTextAutosizing = m_state->getBoolean(PageAgentState::pageAgentTextAutosizingOverride);
 
-    return width != currentWidth || height != currentHeight || deviceScaleFactor != currentDeviceScaleFactor || fitWindow != currentFitWindow;
+    return width != currentWidth || height != currentHeight || deviceScaleFactor != currentDeviceScaleFactor || fitWindow != currentFitWindow || textAutosizing != currentTextAutosizing;
 }
 
 void InspectorPageAgent::setShowPaintRects(ErrorString*, bool show)
@@ -1077,10 +1084,19 @@ PassRefPtr<TypeBuilder::Page::FrameResourceTree> InspectorPageAgent::buildObject
     return result;
 }
 
-void InspectorPageAgent::updateViewMetrics(int width, int height, double deviceScaleFactor, bool fitWindow)
+void InspectorPageAgent::updateViewMetrics(int width, int height, double deviceScaleFactor, bool fitWindow, bool textAutosizing)
 {
     m_client->overrideDeviceMetrics(width, height, static_cast<float>(deviceScaleFactor), fitWindow);
 
+    Settings& settings = m_page->settings();
+    if (m_enabled && textAutosizing) {
+        // FIXME(crbug.com/308800): overriding device metrics results in an incorrect layout width.
+        // This workaround can be removed once that bug is fixed.
+        IntSize textAutosizingWindowSizeOverride = IntSize(width, height);
+        textAutosizingWindowSizeOverride.scale((float)(1.0 / deviceScaleFactor));
+        settings.setTextAutosizingWindowSizeOverride(textAutosizingWindowSizeOverride);
+    }
+
     Document* document = mainFrame()->document();
     if (document)
         document->styleResolverChanged(RecalcStyleImmediately);
@@ -1191,6 +1207,13 @@ DeviceOrientationData* InspectorPageAgent::overrideDeviceOrientation(DeviceOrien
     return deviceOrientation;
 }
 
+bool InspectorPageAgent::overrideTextAutosizing(bool textAutosizing)
+{
+    if (m_enabled)
+        return m_state->getBoolean(PageAgentState::pageAgentTextAutosizingOverride);
+    return textAutosizing;
+}
+
 void InspectorPageAgent::setTouchEmulationEnabled(ErrorString*, bool enabled)
 {
     if (m_state->getBoolean(PageAgentState::touchEventEmulationEnabled) == enabled)