pdfviewer: track what objects have been used during rendering. It will be the base of reporting unu…

experimental/PdfViewer/pdfparser/native/SkPdfNativeObject.cpp

Index: experimental/PdfViewer/pdfparser/native/SkPdfNativeObject.cpp
===================================================================
--- experimental/PdfViewer/pdfparser/native/SkPdfNativeObject.cpp	(revision 11092)
+++ experimental/PdfViewer/pdfparser/native/SkPdfNativeObject.cpp	(working copy)
@@ -66,6 +66,8 @@
 }
 
 bool SkPdfNativeObject::filterStream() {
+    SkPdfMarkObjectUsed();
+
     if (!hasStream()) {
         return false;
     }
@@ -100,6 +102,10 @@
 }
 
 void SkPdfNativeObject::releaseData() {
+    // TODO(edisonn): report here unused objects
+
+    SkPdfMarkObjectUnused();
+
     if (fData) {
         switch (fDataType) {
             case kFont_Data: