Add DPI stettings to SkDocument::CreatePDF(). Tests will be added in a future cl, once DPI will be used in SkPDFDevice

R=reed@google.com, bungeman@google.com, vandebo@chromium.org

Author: edisonn@google.com

Review URL: https://codereview.chromium.org/32233003

git-svn-id: http://skia.googlecode.com/svn/trunk@11886 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/pdf/SkPDFDevice.cpp b/src/pdf/SkPDFDevice.cpp
index e90edb1..1aed856 100644
--- a/src/pdf/SkPDFDevice.cpp
+++ b/src/pdf/SkPDFDevice.cpp
@@ -704,7 +704,8 @@
       fLastContentEntry(NULL),
       fLastMarginContentEntry(NULL),
       fClipStack(NULL),
-      fEncoder(NULL) {
+      fEncoder(NULL),
+      fRasterDpi(SkFloatToScalar(72.0f)) {
     // just report that PDF does not supports perspective
     // TODO(edisonn): update the shape when possible
     // or dump in an image otherwise
@@ -734,7 +735,9 @@
       fExistingClipRegion(existingClipRegion),
       fLastContentEntry(NULL),
       fLastMarginContentEntry(NULL),
-      fClipStack(NULL) {
+      fClipStack(NULL),
+      fEncoder(NULL),
+      fRasterDpi(SkFloatToScalar(72.0f)) {
     fInitialTransform.reset();
     this->init();
 }