PDF: Fix potential bad indexes in find results.

pdf/instance.cc

 // 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.
 
 #include "pdf/instance.h"
 
 #include <algorithm>  // for min()
 #define _USE_MATH_DEFINES  // for M_PI
 #include <cmath>      // for log() and pow()
 #include <math.h>
@@ skipping 1268 matching lines @@
 
   v_scrollbar_->SetTickMarks(
       scaled_tickmarks.empty() ? NULL : &scaled_tickmarks[0], tickmarks.size());
 }
 
 void Instance::NotifyNumberOfFindResultsChanged(int total, bool final_result) {
   NumberOfFindResultsChanged(total, final_result);
 }
 
 void Instance::NotifySelectedFindResultChanged(int current_find_index) {
+  DCHECK_GE(current_find_index, 0);
   SelectedFindResultChanged(current_find_index);
 }
 
 void Instance::OnEvent(uint32 control_id, uint32 event_id, void* data) {
   if (event_id == Button::EVENT_ID_BUTTON_CLICKED ||
       event_id == Button::EVENT_ID_BUTTON_STATE_CHANGED) {
     switch (control_id) {
       case kFitToPageButtonId:
         UserMetricsRecordAction("PDF.FitToPageButton");
         SetZoom(ZOOM_FIT_TO_PAGE, 0);
@@ skipping 1471 matching lines @@
   return instance_->HasScriptableMethod(name, exception);
 }
 
 pp::Var PDFScriptableObject::Call(const pp::Var& method,
                                   const std::vector<pp::Var>& args,
                                   pp::Var* exception) {
   return instance_->CallScriptableMethod(method, args, exception);
 }
 
 }  // namespace chrome_pdf