SkPDF: allow PDF module to be disabled in DM and SampleApp

samplecode/SampleApp.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SampleApp.h"
 
 #include "OverView.h"
@@ skipping 1153 matching lines @@
         canvas->restoreToCount(count);
 }
 
 void SampleWindow::onDraw(SkCanvas* canvas) {
 }
 
 #include "SkColorPriv.h"
 
 void SampleWindow::saveToPdf()
 {
+#if SK_SUPPORT_PDF

[reed1, 2015/08/11 15:41:04]

Why are we guarding here? Do we not gracefully fail w/ no guards?

     fSaveToPdf = true;
     this->inval(NULL);
+#endif  // SK_SUPPORT_PDF
 }
 
 SkCanvas* SampleWindow::beforeChildren(SkCanvas* canvas) {
     if (fSaveToPdf) {
         SkString name;
         if (!this->getRawTitle(&name)) {
             name.set("unknown_sample");
         }
         name.append(".pdf");
 #ifdef SK_BUILD_FOR_ANDROID
@@ skipping 1116 matching lines @@
     setenv("ANDROID_ROOT", "/android/device/data", 0);
 #endif
     SkGraphics::Init();
     SkEvent::Init();
 }
 
 void application_term() {
     SkEvent::Term();
     SkGraphics::Term();
 }