Introduce the notion of a "layout test mode" instead of turning individual flags on and off

content/public/test/layouttest_support.h

Index: content/public/test/layouttest_support.h
diff --git a/content/public/test/layouttest_support.h b/content/public/test/layouttest_support.h
index 4d0e444f0fb887df24cd81a2dfe604cbc4f796fb..ed490ec5a12363a4d89b66521013791e92af7eb1 100644
--- a/content/public/test/layouttest_support.h
+++ b/content/public/test/layouttest_support.h
@@ -20,6 +20,15 @@ namespace content {
 
 class RenderView;
 
+// Turn the browser process into layout test mode.
+void EnableBrowserLayoutTestMode();
+
+///////////////////////////////////////////////////////////////////////////////
+// The following methods are meant to be used from a renderer.
+
+// Turn a renderer into layout test mode.
+void EnableRendererLayoutTestMode();
+
 // Enable injecting of a WebTestProxy between WebViews and RenderViews.
 // |callback| is invoked with a pointer to WebTestProxyBase for each created
 // WebTestProxy.
@@ -30,20 +39,9 @@ void EnableWebTestProxyCreation(const base::Callback<
 // WebKitPlatformSupport::sampleGamepads().
 void SetMockGamepads(const WebKit::WebGamepads& pads);
 
-// Disable logging to the console from the appcache system.
-void DisableAppCacheLogging();
-
-// Enable testing support in the devtools client.
-void EnableDevToolsFrontendTesting();
-
 // Returns the length of the local session history of a render view.
 int GetLocalSessionHistoryLength(RenderView* render_view);
 
-void SetAllowOSMesaImageTransportForTesting();
-
-// Suppress sending focus events from the renderer to the browser.
-void DoNotSendFocusEvents();
-
 // Sync the current session history to the browser process.
 void SyncNavigationState(RenderView* render_view);
 
@@ -52,26 +50,13 @@ void SyncNavigationState(RenderView* render_view);
 // process.
 void SetFocusAndActivate(RenderView* render_view, bool enable);
 
-// When WebKit requests a size change, immediately report the new sizes back to
-// WebKit instead of waiting for the browser to acknowledge the new size.
-void EnableShortCircuitSizeUpdates();
-
 // Changes the window rect of the given render view.
 void ForceResizeRenderView(RenderView* render_view,
                            const WebKit::WebSize& new_size);
 
-// Never display error pages when a navigation fails.
-void DisableNavigationErrorPages();
-
 // Set the device scale factor and force the compositor to resize.
 void SetDeviceScaleFactor(RenderView* render_view, float factor);
 
-// Disable system calls related to drag & drop.
-void DisableSystemDragDrop();
-
-// Don't show modal popup menus.
-void DisableModalPopupMenus();
-
 // Control auto resize mode.
 void EnableAutoResizeMode(RenderView* render_view,
                           const WebKit::WebSize& min_size,