Update the SkDocument interface to allow for 1) abort won't emit pdf, 2) close can report success/f…

src/doc/SkDocument.cpp

Index: src/doc/SkDocument.cpp
diff --git a/src/doc/SkDocument.cpp b/src/doc/SkDocument.cpp
index 055c749792bb29c4de263c8e55f96d80b4ee08ab..0989c141b8532b58250aefd3bc1fc966455ff501 100644
--- a/src/doc/SkDocument.cpp
+++ b/src/doc/SkDocument.cpp
@@ -22,20 +22,20 @@ SkDocument::~SkDocument() {
 
 SkCanvas* SkDocument::beginPage(SkScalar width, SkScalar height,
                                 const SkRect* content) {
-    if (width <= 0 || height <= 0) {
-        return NULL;
-    }
+     if (width <= 0 || height <= 0) {
+         return NULL;
+     }
 
-    SkRect outer = SkRect::MakeWH(width, height);
-    SkRect inner;
-    if (content) {
-        inner = *content;
-        if (!inner.intersect(outer)) {
-            return NULL;
-        }
-    } else {
-        inner = outer;
-    }
+     SkRect outer = SkRect::MakeWH(width, height);
+     SkRect inner;
+     if (content) {
+         inner = *content;
+         if (!inner.intersect(outer)) {
+             return NULL;
+         }
+     } else {
+         inner = outer;
+     }
 
     for (;;) {
         switch (fState) {
@@ -60,12 +60,12 @@ void SkDocument::endPage() {
     }
 }
 
-void SkDocument::close() {
+bool SkDocument::close() {
     for (;;) {
         switch (fState) {
-            case kBetweenPages_State:
+            case kBetweenPages_State: {
                 fState = kClosed_State;
-                this->onClose(fStream);
+                bool success = this->onClose(fStream);
 
                 if (fDoneProc) {
                     fDoneProc(fStream);
@@ -73,12 +73,17 @@ void SkDocument::close() {
                 // we don't own the stream, but we mark it NULL since we can
                 // no longer write to it.
                 fStream = NULL;
-                return;
+                return success;
+            }
             case kInPage_State:
                 this->endPage();
                 break;
             case kClosed_State:
-                return;
+                return false;
         }
     }
 }
+
+void SkDocument::abort() {
+    fState = kClosed_State;
+}