Always read .skp files and other serialized pictures into SkRecord.

This should switch all our internal tools that aren't clever about it over to SkRecord pictures.  (The clever tools know what they're doing.)

Also, deletes the old SkPicture::clone() path.  return this or die.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/7b705bb17e09508e3761b54f59833b1ceb4ce9a6

R=robertphillips@google.com, mtklein@google.com, reed@google.com

Author: mtklein@chromium.org

Review URL: https://codereview.chromium.org/481743003
diff --git a/src/core/SkPicture.cpp b/src/core/SkPicture.cpp
index 469a208..70c1f67 100644
--- a/src/core/SkPicture.cpp
+++ b/src/core/SkPicture.cpp
@@ -431,7 +431,8 @@
         if (NULL == data) {
             return NULL;
         }
-        return Forwardport(SkPicture(data, info.fWidth, info.fHeight));
+        const SkPicture src(data, info.fWidth, info.fHeight);
+        return Forwardport(src);
     }
 
     return NULL;
@@ -451,7 +452,8 @@
         if (NULL == data) {
             return NULL;
         }
-        return Forwardport(SkPicture(data, info.fWidth, info.fHeight));
+        const SkPicture src(data, info.fWidth, info.fHeight);
+        return Forwardport(src);
     }
 
     return NULL;