Add private PPAPI interfaces for PDFium accessibility.

ppapi/proxy/pdf_resource.cc

Index: ppapi/proxy/pdf_resource.cc
diff --git a/ppapi/proxy/pdf_resource.cc b/ppapi/proxy/pdf_resource.cc
index 914e6957e21e569feebec0fa640e28e32ce07e16..9ef016ecabb4c0ff5ce367d2ca03d697a580d373 100644
--- a/ppapi/proxy/pdf_resource.cc
+++ b/ppapi/proxy/pdf_resource.cc
@@ -168,5 +168,33 @@ void PDFResource::GetV8ExternalSnapshotData(const char** natives_data_out,
       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