Material PDF: Add metrics to count usage of PDF title and bookmarks

pdf/out_of_process_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/out_of_process_instance.h"
 
 #include <algorithm>  // for min/max()
 #define _USE_MATH_DEFINES  // for M_PI
 #include <cmath>      // for log() and pow()
 #include <math.h>
@@ skipping 1094 matching lines @@
   // Note: If we are in print preview mode the scroll location is retained
   // across document loads so we don't want to scroll again and override it.
   if (IsPrintPreview()) {
     AppendBlankPrintPreviewPages();
     OnGeometryChanged(0, 0);
   }
 
   pp::VarDictionary metadata_message;
   metadata_message.Set(pp::Var(kType), pp::Var(kJSMetadataType));
   std::string title = engine_->GetMetadata("Title");
-  if (!base::TrimWhitespace(base::UTF8ToUTF16(title), base::TRIM_ALL).empty())
+  bool has_title =
+      !base::TrimWhitespace(base::UTF8ToUTF16(title), base::TRIM_ALL).empty();
+  if (has_title)
     metadata_message.Set(pp::Var(kJSTitle), pp::Var(title));
+  uma_.HistogramEnumeration("PDF.HasFeature.Title", has_title ? 1 : 0, 2);
 
-  metadata_message.Set(pp::Var(kJSBookmarks), engine_->GetBookmarks());
+  pp::VarArray bookmarks = engine_->GetBookmarks();
+  metadata_message.Set(pp::Var(kJSBookmarks), bookmarks);
+  uma_.HistogramEnumeration("PDF.HasFeature.Bookmarks",
+                            bookmarks.GetLength() > 0 ? 1 : 0, 2);
   PostMessage(metadata_message);
 
   pp::VarDictionary progress_message;
   progress_message.Set(pp::Var(kType), pp::Var(kJSLoadProgressType));
   progress_message.Set(pp::Var(kJSProgressPercentage), pp::Var(100));
   PostMessage(progress_message);
 
   if (!full_)
     return;
 
@@ skipping 287 matching lines @@
     const pp::FloatPoint& scroll_offset) {
   float max_x = document_size_.width() * zoom_ - plugin_dip_size_.width();
   float x = std::max(std::min(scroll_offset.x(), max_x), 0.0f);
   float min_y = -top_toolbar_height_;
   float max_y = document_size_.height() * zoom_ - plugin_dip_size_.height();
   float y = std::max(std::min(scroll_offset.y(), max_y), min_y);
   return pp::FloatPoint(x, y);
 }
 
 }  // namespace chrome_pdf