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

content/public/browser/web_contents.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_
 
 #include <stdint.h>
 
 #include <set>
@@ skipping 689 matching lines @@
   virtual void ResumeMediaSession() = 0;
   // Requests to suspend the current media session.
   virtual void SuspendMediaSession() = 0;
   // Requests to stop the current media session.
   virtual void StopMediaSession() = 0;
 
 #if defined(OS_ANDROID)
   CONTENT_EXPORT static WebContents* FromJavaWebContents(
       jobject jweb_contents_android);
   virtual base::android::ScopedJavaLocalRef<jobject> GetJavaWebContents() = 0;
+
+  // Selects and zooms to the find result nearest to the point (x,y) defined in
+  // find-in-page coordinates.

[ncarter (slow), 2016/04/06 19:08:03]

Could you document what find-in-page coordinates are?

[paulmeyer, 2016/04/07 17:36:15]

Find-in-page coordinates are explained in FindInPageCoordinates.h
(https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit...).

I just copied this comment from the existing
FindTabHelper::ActivateNearestFindResult() method. You will notice if you search
for references
(https://code.google.com/p/chromium/codesearch#search/&q=%22find-in-page%20coo...)
that these coordinates are referred to without further explanation in all of the
places they are used. I'm not sure if it is worth changing the comment here.

+  virtual void ActivateNearestFindResult(float x, float y) = 0;
+
+  // Requests the rects of the current find matches from the renderers.

[ncarter (slow), 2016/04/06 19:08:03]

Could you document what |current_version| means, who generates them (do they
come from content or the embedder?) and what the semantics are?

[paulmeyer, 2016/04/07 17:36:15]

Done.

+  virtual void RequestFindMatchRects(int current_version) = 0;
 #elif defined(OS_MACOSX)
   // Allowing other views disables optimizations which assume that only a single
   // WebContents is present.
   virtual void SetAllowOtherViews(bool allow) = 0;
 
   // Returns true if other views are allowed, false otherwise.
   virtual bool GetAllowOtherViews() = 0;
 #endif  // OS_ANDROID
 
  private:
   // This interface should only be implemented inside content.
   friend class WebContentsImpl;
   WebContents() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_