Implement SkPicture::bytesUsed() for SkRecord backend

src/core/SkPicture.cpp

Index: src/core/SkPicture.cpp
diff --git a/src/core/SkPicture.cpp b/src/core/SkPicture.cpp
index 160dd4b420df044adc9e03d761db7307cbcba459..e2dbed1b8604443507fe532c6ef2948d1f66de37 100644
--- a/src/core/SkPicture.cpp
+++ b/src/core/SkPicture.cpp
@@ -564,6 +564,22 @@ bool SkPicture::hasText() const {
     return false;
 }
 
+size_t SkPicture::bytesUsed() const {
+    size_t byteCount = sizeof(SkPicture);
+
+    // No support for old SkPicture backend
+    if (!fRecord.get()) {
+        return 0;
+    }
+
+    byteCount += fRecord->bytesUsed();
+    if (fBBH.get()) {
+        byteCount += fBBH->bytesUsed();
+    }
+    return byteCount;
+}
+
+
 // fRecord OK
 bool SkPicture::willPlayBackBitmaps() const {
     if (fRecord.get()) {