Split picture version into min & max supported versions

src/core/SkPicture.cpp

Index: src/core/SkPicture.cpp
===================================================================
--- src/core/SkPicture.cpp	(revision 13567)
+++ src/core/SkPicture.cpp	(working copy)
@@ -273,7 +273,7 @@
         return false;
     }
 
-    if (PICTURE_VERSION != info.fVersion) {
+    if (info.fVersion < MIN_PICTURE_VERSION || info.fVersion > CURRENT_PICTURE_VERSION) {
         return false;
     }
 
@@ -297,7 +297,7 @@
         return false;
     }
 
-    if (PICTURE_VERSION != info.fVersion) {
+    if (info.fVersion < MIN_PICTURE_VERSION || info.fVersion > CURRENT_PICTURE_VERSION) {
         return false;
     }
 
@@ -362,7 +362,7 @@
 
     // Set piture info after magic bytes in the header
     SkPictInfo* info = (SkPictInfo*)(((char*)header) + sizeof(kMagic));
-    info->fVersion = PICTURE_VERSION;
+    info->fVersion = CURRENT_PICTURE_VERSION;
     info->fWidth = fWidth;
     info->fHeight = fHeight;
     info->fFlags = SkPictInfo::kCrossProcess_Flag;