[Mac] Remove flicker when typing in the findbar....

chrome/browser/cocoa/find_bar_cocoa_controller.mm

 // Copyright (c) 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.
 
 #import <Cocoa/Cocoa.h>
 
 #include "app/l10n_util.h"
 #include "base/mac_util.h"
 #include "base/sys_string_conversions.h"
 #include "grit/generated_resources.h"
@@ skipping 74 matching lines @@
 }
 
 - (IBAction)nextResult:(id)sender {
   if (findBarBridge_)
     findBarBridge_->GetFindBarController()->tab_contents()->StartFinding(
         base::SysNSStringToUTF16([findText_ stringValue]),
         true, false);
 }
 
 - (void)findPboardUpdated:(NSNotification*)notification {
+  if (suppressPboardUpdateActions_)
+    return;
   [self prepopulateText:[[FindPasteboard sharedInstance] findText]
              stopSearch:YES];
 }
 
 // Positions the find bar container view in the correct location based on the
 // current state of the window.  The find bar container is always positioned one
 // pixel above the infobar container.  Note that we are using the infobar
 // container location as a proxy for the toolbar location, but we cannot
 // position based on the toolbar because the toolbar is not always present (for
 // example in fullscreen windows).
@@ skipping 20 matching lines @@
 - (void)controlTextDidChange:(NSNotification *)aNotification {
   if (!findBarBridge_)
     return;
 
   TabContents* tab_contents =
       findBarBridge_->GetFindBarController()->tab_contents();
   if (!tab_contents)
     return;
 
   NSString* findText = [findText_ stringValue];
+  suppressPboardUpdateActions_ = YES;
   [[FindPasteboard sharedInstance] setFindText:findText];
+  suppressPboardUpdateActions_ = NO;
 
   if ([findText length] > 0) {
     tab_contents->StartFinding(base::SysNSStringToUTF16(findText), true, false);
   } else {
     // The textbox is empty so we reset.
     tab_contents->StopFinding(true);  // true = clear selection on page.
     [self updateUIForFindResult:tab_contents->find_result()
                        withText:string16()];
   }
 }
@@ skipping 222 matching lines @@
     }
   }
 
   // Has to happen after |ClearResults()| above.
   BOOL buttonsEnabled = [text length] > 0 ? YES : NO;
   [previousButton_ setEnabled:buttonsEnabled];
   [nextButton_ setEnabled:buttonsEnabled];
 }
 
 @end