pdfviewer: add indexed rbg image support, enhanche caching(setData) for SkPdfObject

experimental/PdfViewer/pdfparser/native/SkPdfObject.cpp

Index: experimental/PdfViewer/pdfparser/native/SkPdfObject.cpp
===================================================================
--- experimental/PdfViewer/pdfparser/native/SkPdfObject.cpp	(revision 10402)
+++ experimental/PdfViewer/pdfparser/native/SkPdfObject.cpp	(working copy)
@@ -6,6 +6,9 @@
 #include "SkStream.h"
 #include "SkPdfNativeTokenizer.h"
 
+#include "SkBitmap.h"
+#include "SkPdfFont.h"
+
 SkPdfObject SkPdfObject::kNull = SkPdfObject::makeNull();
 
 bool SkPdfObject::applyFlateDecodeFilter() {
@@ -86,3 +89,21 @@
 
     return true;
 }
+
+void SkPdfObject::releaseData() {
+    if (fData) {
+        switch (fDataType) {
+            case kFont_Data:
+                delete (SkPdfFont*)fData;
+                break;
+            case kBitmap_Data:
+                delete (SkBitmap*)fData;
+                break;
+            default:
+                SkASSERT(false);
+                break;
+        }
+    }
+    fData = NULL;
+    fDataType = kEmpty_Data;
+}