Implement a shell of FindRequestManager, and hook it up to WebContentsImpl.

content/browser/web_contents/web_contents_impl.h

Index: content/browser/web_contents/web_contents_impl.h
diff --git a/content/browser/web_contents/web_contents_impl.h b/content/browser/web_contents/web_contents_impl.h
index 77f73eab30e09edb9196b3b5000b5d75966a7f28..6ef11bdd3f0b1050d32e83ee4ecb58f55879d6bd 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -56,6 +56,7 @@ class BrowserPluginEmbedder;
 class BrowserPluginGuest;
 class DateTimeChooserAndroid;
 class DownloadItem;
+class FindRequestManager;
 class GeolocationServiceContext;
 class InterstitialPageImpl;
 class JavaScriptDialogManager;
@@ -384,6 +385,8 @@ class CONTENT_EXPORT WebContentsImpl
 #if defined(OS_ANDROID)
   base::android::ScopedJavaLocalRef<jobject> GetJavaWebContents() override;
   virtual WebContentsAndroid* GetWebContentsAndroid();
+  void ActivateNearestFindResult(float x, float y) override;
+  void RequestFindMatchRects(int current_version) override;
 #elif defined(OS_MACOSX)
   void SetAllowOtherViews(bool allow) override;
   bool GetAllowOtherViews() override;
@@ -746,6 +749,9 @@ class CONTENT_EXPORT WebContentsImpl
   FRIEND_TEST_ALL_PREFIXES(SitePerProcessAccessibilityBrowserTest,
                            CrossSiteIframeAccessibility);
 
+  // So FindRequestManager can access FindReply/FindMatchRectsReply.
+  friend class FindRequestManager;

[lfg, 2016/04/04 18:57:32]

Those functions can be public in WebContentsImpl instead of this.

+
   // So InterstitialPageImpl can access SetIsLoading.
   friend class InterstitialPageImpl;
 
@@ -779,7 +785,7 @@ class CONTENT_EXPORT WebContentsImpl
     }
 
    private:
-    // The outer Webontents.
+    // The outer WebContents.
     WebContentsImpl* outer_web_contents_;
     // The ID of the FrameTreeNode in outer WebContents that is hosting us.
     int outer_contents_frame_tree_node_id_;
@@ -877,7 +883,7 @@ class CONTENT_EXPORT WebContentsImpl
   void OnFindMatchRectsReply(int version,
                              const std::vector<gfx::RectF>& rects,
                              const gfx::RectF& active_rect);
-
+  void OnGetNearestFindResultReply(int request_id, float distance);
   void OnOpenDateTimeDialog(
       const ViewHostMsg_DateTimeDialogValue_Params& value);
 #endif
@@ -1031,6 +1037,24 @@ class CONTENT_EXPORT WebContentsImpl
   void SetJavaScriptDialogManagerForTesting(
       JavaScriptDialogManager* dialog_manager);
 
+  // Returns the FindRequestManager, or creates one if it doesn't already exist.
+  FindRequestManager* GetOrCreateFindRequestManager();
+
+  // Called by FindRequestManager when find replies come in from a renderer
+  // process.
+  void FindReply(int request_id,
+                 int number_of_matches,
+                 const gfx::Rect& selection_rect,
+                 int active_match_ordinal,
+                 bool final_update);
+
+#if defined(OS_ANDROID)
+  // Called by FindRequestManager when all of the match rects are in.
+  void FindMatchRectsReply(int version,
+                           const std::vector<gfx::RectF>& rects,
+                           const gfx::RectF& active_rect);
+#endif
+
   // Data for core operation ---------------------------------------------------
 
   // Delegate for notifying our owner about stuff. Not owned by us.
@@ -1082,6 +1106,9 @@ class CONTENT_EXPORT WebContentsImpl
   // SavePackage, lazily created.
   scoped_refptr<SavePackage> save_package_;
 
+  // Manages/coordinates find-in-page requests. Created lazily.
+  scoped_ptr<FindRequestManager> find_request_manager_;
+
   // Data for loading state ----------------------------------------------------
 
   // Indicates whether the current load is to a different document. Only valid