OOPIF support for testRunner.dumpAsText and similar layout dumps.

content/shell/renderer/layout_test/layout_test_render_frame_observer.h

Index: content/shell/renderer/layout_test/layout_test_render_frame_observer.h
diff --git a/content/shell/renderer/layout_test/layout_test_render_frame_observer.h b/content/shell/renderer/layout_test/layout_test_render_frame_observer.h
index a5a4ede7bfe353098b1ee25114cac40ea5251699..5ce62f0d582fc6d09c254751248376b9d1ece2f6 100644
--- a/content/shell/renderer/layout_test/layout_test_render_frame_observer.h
+++ b/content/shell/renderer/layout_test/layout_test_render_frame_observer.h
@@ -6,8 +6,13 @@
 #define CONTENT_SHELL_RENDERER_LAYOUT_TEST_LAYOUT_TEST_RENDER_FRAME_OBSERVER_H_
 
 #include "base/macros.h"
+#include "components/test_runner/layout_dump_flags.h"
 #include "content/public/renderer/render_frame_observer.h"
 
+namespace IPC {
+class Message;
+}  // namespace IPC
+
 namespace content {
 class RenderFrame;
 
@@ -16,7 +21,11 @@ class LayoutTestRenderFrameObserver : public RenderFrameObserver {
   explicit LayoutTestRenderFrameObserver(RenderFrame* render_frame);
   ~LayoutTestRenderFrameObserver() override {}
 
+  bool OnMessageReceived(const IPC::Message& message) override;
+
  private:
+  void OnLayoutDumpRequest(test_runner::LayoutDumpFlags layout_dump_flags);
+
   DISALLOW_COPY_AND_ASSIGN(LayoutTestRenderFrameObserver);
 };