Implements PrintBrowser mode.

third_party/WebKit/Source/core/frame/FrameView.h

Index: third_party/WebKit/Source/core/frame/FrameView.h
diff --git a/third_party/WebKit/Source/core/frame/FrameView.h b/third_party/WebKit/Source/core/frame/FrameView.h
index 0bb8fe3b87305d87c698e7076d20724e3eb468a9..8847039d998f6a8986ed0a4c9f8f96627055fa48 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.h
+++ b/third_party/WebKit/Source/core/frame/FrameView.h
@@ -89,6 +89,7 @@ class PaintArtifactCompositor;
 class PaintController;
 class PaintInvalidationState;
 class Page;
+class PrintContext;
 class ScrollingCoordinator;
 class TracedValue;
 class TransformState;
@@ -888,6 +889,11 @@ class CORE_EXPORT FrameView final
 
   void updateScrollbarEnabledState();
 
+  void dispatchEventsForPrintingOnAllFrames();
+
+  void setupPrintContext();
+  void clearPrintContext();
+
   void updateLifecyclePhasesInternal(
       DocumentLifecycle::LifecycleState targetState);
 
@@ -1202,6 +1208,8 @@ class CORE_EXPORT FrameView final
   std::unique_ptr<CompositorAnimationHost> m_animationHost;
 
   std::unique_ptr<GeometryMapper> m_geometryMapper;
+
+  Member<PrintContext> m_printContext;
 };
 
 inline void FrameView::incrementVisuallyNonEmptyCharacterCount(unsigned count) {