PDF accessibility tweaks

pdf/out_of_process_instance.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 PDF_OUT_OF_PROCESS_INSTANCE_H_
 #define PDF_OUT_OF_PROCESS_INSTANCE_H_
 
 #include <stdint.h>
 #include <string.h>
 
@@ skipping 61 matching lines @@
       const PP_PrintPageNumberRange_Dev* page_ranges,
       uint32_t page_range_count) override;
   void PrintEnd() override;
   bool IsPrintScalingDisabled() override;
 
   // pp::Private implementation.
   pp::Var GetLinkAtPosition(const pp::Point& point);
   void GetPrintPresetOptionsFromDocument(PP_PdfPrintPresetOptions_Dev* options);
   void EnableAccessibility();
 
+  // Start loading accessibility information.
+  void LoadAccessibility();
+
   // Send accessibility information about the given page index.
   void SendNextAccessibilityPage(int32_t page_index);
 
   void FlushCallback(int32_t result);
   void DidOpen(int32_t result);
   void DidOpenPreview(int32_t result);
 
   // Called when the timer is fired.
   void OnClientTimerFired(int32_t id);
 
@@ skipping 247 matching lines @@
   // zooming the plugin so that flickering doesn't occur while zooming.
   bool stop_scrolling_;
 
   // The background color of the PDF viewer.
   uint32_t background_color_;
 
   // The blank space above the first page of the document reserved for the
   // toolbar.
   int top_toolbar_height_;
 
-  // Whether we should send accessibility information about the loaded PDF.
-  bool accessibility_enabled_;
+  // The current state of accessibility: either off, enabled but waiting
+  // for the document to load, or fully loaded.
+  enum AccessibilityState {
+    ACCESSIBILITY_STATE_OFF,
+    ACCESSIBILITY_STATE_PENDING,  // Enabled but waiting for doc to load.
+    ACCESSIBILITY_STATE_LOADED
+  } accessibility_state_;
 
   DISALLOW_COPY_AND_ASSIGN(OutOfProcessInstance);
 };
 
 }  // namespace chrome_pdf
 
 #endif  // PDF_OUT_OF_PROCESS_INSTANCE_H_