Find should allow keyboard scrolling while Find bar has focus

chrome/browser/views/find_bar_view.cc

 // Copyright (c) 2006-2009 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.
 
 #include "chrome/browser/views/find_bar_view.h"
 
 #include <algorithm>
 
 #include "base/string_util.h"
 #include "chrome/browser/find_bar_controller.h"
@@ skipping 455 matching lines @@
   // initiate search (even though old searches might be in progress).
   if (new_contents.length() > 0) {
     controller->web_contents()->StartFinding(new_contents, true);
   } else {
     // The textbox is empty so we reset.  true = clear selection on page.
     controller->web_contents()->StopFinding(true);
     UpdateForResult(controller->web_contents()->find_result(), std::wstring());
   }
 }
 
-void FindBarView::HandleKeystroke(views::TextField* sender, UINT message,
+bool FindBarView::HandleKeystroke(views::TextField* sender, UINT message,
                                   TCHAR key, UINT repeat_count, UINT flags) {
   // If the dialog is not visible, there is no reason to process keyboard input.
   if (!container_->IsVisible())
-    return;
+    return false;
 
   switch (key) {
     case VK_RETURN: {
       // Pressing Return/Enter starts the search (unless text box is empty).
       std::wstring find_string = find_text_->GetText();
       if (find_string.length() > 0) {
         // Search forwards for enter, backwards for shift-enter.
         container_->GetFindBarController()->web_contents()->StartFinding(
             find_string,
             GetKeyState(VK_SHIFT) >= 0);
       }
       break;
     }
+#if defined(OS_WIN)
+    // TODO(port): Handle this for other platforms.
+    case VK_UP:
+    case VK_DOWN:
+    case VK_PRIOR:  // Page up
+    case VK_NEXT:   // Page down
+      container_->ForwardKeystrokeToWebpage(key);
+      return true;  // Message has been handled. No further processing needed.
+#endif
   }
+
+  return false;
 }
 
 void FindBarView::ResetMatchCountBackground() {
   match_count_text_->set_background(
       views::Background::CreateSolidBackground(kBackgroundColorMatch));
   match_count_text_->SetColor(kTextColorMatchCount);
 }
 
 bool FindBarView::FocusForwarderView::OnMousePressed(
     const views::MouseEvent& event) {
   if (view_to_focus_on_mousedown_) {
     view_to_focus_on_mousedown_->ClearSelection();
     view_to_focus_on_mousedown_->RequestFocus();
   }
   return true;
 }