Mojoify the RequestThumbnailForContextNode IPC message and reply

chrome/renderer/chrome_render_frame_observer.h

Index: chrome/renderer/chrome_render_frame_observer.h
diff --git a/chrome/renderer/chrome_render_frame_observer.h b/chrome/renderer/chrome_render_frame_observer.h
index a9dad7bb1b30c6bf0ca5efa8ab522ef0486eb7c4..53c0d248fa31664c6a8893e338ef5fa9deda34ff 100644
--- a/chrome/renderer/chrome_render_frame_observer.h
+++ b/chrome/renderer/chrome_render_frame_observer.h
@@ -8,7 +8,9 @@
 #include "base/macros.h"
 #include "base/timer/timer.h"
 #include "chrome/common/prerender_types.h"
+#include "chrome/common/thumbnail_capturer.mojom.h"
 #include "content/public/renderer/render_frame_observer.h"
+#include "mojo/public/cpp/bindings/binding_set.h"
 
 namespace gfx {
 class Size;
@@ -24,7 +26,8 @@ class TranslateHelper;
 
 // This class holds the Chrome specific parts of RenderFrame, and has the same
 // lifetime.
-class ChromeRenderFrameObserver : public content::RenderFrameObserver {
+class ChromeRenderFrameObserver : public content::RenderFrameObserver,
+                                  public chrome::mojom::ThumbnailCapturer {
  public:
   explicit ChromeRenderFrameObserver(content::RenderFrame* render_frame);
   ~ChromeRenderFrameObserver() override;
@@ -41,6 +44,14 @@ class ChromeRenderFrameObserver : public content::RenderFrameObserver {
   void DidMeaningfulLayout(blink::WebMeaningfulLayout layout_type) override;
   void OnDestruct() override;
 
+  // chrome::mojom::ThumbnailCapturer:
+  void OnThumbnailCapturerRequest(
+      chrome::mojom::ThumbnailCapturerRequest request);
+  void RequestThumbnailForContextNode(
+      int32_t thumbnail_min_area_pixels,
+      const gfx::Size& thumbnail_max_size_pixels,
+      const RequestThumbnailForContextNodeCallback& callback) override;
+
   // IPC handlers
   void OnSetIsPrerendering(prerender::PrerenderMode mode);
   void OnRequestReloadImageForContextNode();
@@ -65,6 +76,9 @@ class ChromeRenderFrameObserver : public content::RenderFrameObserver {
   translate::TranslateHelper* translate_helper_;
   safe_browsing::PhishingClassifierDelegate* phishing_classifier_;
 
+  mojo::BindingSet<chrome::mojom::ThumbnailCapturer>
+      thumbnail_capturer_bindings_;
+
   DISALLOW_COPY_AND_ASSIGN(ChromeRenderFrameObserver);
 };