Add private PPAPI interfaces for PDFium accessibility.

ppapi/proxy/pdf_resource.cc

 // Copyright (c) 2013 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 "ppapi/proxy/pdf_resource.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
@@ skipping 150 matching lines @@
 }
 
 void PDFResource::GetV8ExternalSnapshotData(const char** natives_data_out,
                                             int* natives_size_out,
                                             const char** snapshot_data_out,
                                             int* snapshot_size_out) {
   gin::V8Initializer::GetV8ExternalSnapshotData(
       natives_data_out, natives_size_out, snapshot_data_out, snapshot_size_out);
 }
 
+void PDFResource::SetAccessibilityDocInfo(
+    PP_PrivateAccessibilityDocInfo* doc_info) {
+  Post(RENDERER, PpapiHostMsg_PDF_SetAccessibilityDocInfo(*doc_info));
+}
+
+void PDFResource::SetAccessibilityViewportInfo(
+    PP_PrivateAccessibilityViewportInfo* viewport_info) {
+  Post(RENDERER, PpapiHostMsg_PDF_SetAccessibilityViewportInfo(*viewport_info));
+}
+
+void PDFResource::SetAccessibilityPageInfo(
+    PP_PrivateAccessibilityPageInfo* page_info,
+    PP_PrivateAccessibilityTextRunInfo text_runs[],
+    PP_PrivateAccessibilityCharInfo chars[]) {
+  std::vector<PP_PrivateAccessibilityTextRunInfo> text_run_vector;

[raymes, 2016/05/30 04:17:37]

You should be able to initialize the vector with the data:
std::vector<...> text_run_vector(text_runs, text_runs +
page_info->text_run_count);

You may want to test how much overhead the extra copy introduces here on very
large documents. It may be worth optimizing to get rid of it but we don't have
to for the first version.

[dmazzoni, 2016/05/31 21:45:02]

Good idea, done.

Since this is per-page it shouldn't be too bad. I'll definitely
look at some actual numbers when landing the following changes
to finish this feature.

+  text_run_vector.resize(page_info->text_run_count);
+  for (size_t i = 0; i < page_info->text_run_count; ++i)
+    text_run_vector[i] = text_runs[i];
+
+  std::vector<PP_PrivateAccessibilityCharInfo> char_vector;

[raymes, 2016/05/30 04:17:37]

nit: same here

[dmazzoni, 2016/05/31 21:45:01]

Done.

+  char_vector.resize(page_info->char_count);
+  for (size_t i = 0; i < page_info->char_count; ++i)
+    char_vector[i] = chars[i];
+
+  Post(RENDERER, PpapiHostMsg_PDF_SetAccessibilityPageInfo(
+      *page_info, text_run_vector, char_vector));
+}
+
 }  // namespace proxy
 }  // namespace ppapi