Do all the font UMA work in PdfMetafileSkia::FinishDocument.

printing/pdf_metafile_skia.cc

Index: printing/pdf_metafile_skia.cc
diff --git a/printing/pdf_metafile_skia.cc b/printing/pdf_metafile_skia.cc
index 2558a8453a95f34229ee906e3bb17470a90b130e..beda36f8ae488472fdc2291c6332a401e87a1640 100644
--- a/printing/pdf_metafile_skia.cc
+++ b/printing/pdf_metafile_skia.cc
@@ -22,18 +22,12 @@
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
-namespace {
-  typedef base::hash_map<SkFontID, SkAdvancedTypefaceMetrics::FontType>
-      FontTypeMap;
-};
-
 namespace printing {
 
 struct PdfMetafileSkiaData {
   SkRefPtr<SkPDFDevice> current_page_;
   SkPDFDocument pdf_doc_;
   SkDynamicMemoryWStream pdf_stream_;
-  FontTypeMap font_type_stats_;
 };
 
 PdfMetafileSkia::~PdfMetafileSkia() {}
@@ -81,13 +75,6 @@ bool PdfMetafileSkia::StartPage(const gfx::Size& page_size,
 bool PdfMetafileSkia::FinishPage() {
   DCHECK(data_->current_page_.get());
 
-  const SkTDArray<SkPDFFont*>& font_resources =
-      data_->current_page_->getFontResources();
-  for (int i = 0; i < font_resources.count(); i++) {
-    SkFontID key = font_resources[i]->typeface()->uniqueID();
-    data_->font_type_stats_[key] = font_resources[i]->getType();
-  }
-
   data_->pdf_doc_.appendPage(data_->current_page_);
   data_->current_page_ = NULL;
   return true;
@@ -101,13 +88,22 @@ bool PdfMetafileSkia::FinishDocument() {
   if (data_->current_page_.get())
     FinishPage();
 
-  for (FontTypeMap::const_iterator it = data_->font_type_stats_.begin();
-       it != data_->font_type_stats_.end();
-       it++) {
-    UMA_HISTOGRAM_ENUMERATION(
-        "PrintPreview.FontType",
-        it->second,
-        SkAdvancedTypefaceMetrics::kNotEmbeddable_Font + 1);
+  base::hash_set<SkFontID> font_set;
+
+  const SkTDArray<SkPDFPage*>& pages = data_->pdf_doc_.getPages();
+  for (int page_number = 0; page_number < pages.count(); page_number++) {
+    const SkTDArray<SkPDFFont*>& font_resources =
+        pages[page_number]->getFontResources();
+    for (int font = 0; font < font_resources.count(); font++) {
+      SkFontID font_id = font_resources[font]->typeface()->uniqueID();
+      if (font_set.find(font_id) == font_set.end()) {
+        font_set.insert(font_id);
+        UMA_HISTOGRAM_ENUMERATION(
+            "PrintPreview.FontType",
+            font_resources[font]->getType(),
+            SkAdvancedTypefaceMetrics::kNotEmbeddable_Font + 1);
+      }
+    }
   }
 
   return data_->pdf_doc_.emitPDF(&data_->pdf_stream_);