[BlobStorage] Enforcing renderer constraints to prevent broken blobs

third_party/WebKit/Source/platform/blob/BlobData.h

Index: third_party/WebKit/Source/platform/blob/BlobData.h
diff --git a/third_party/WebKit/Source/platform/blob/BlobData.h b/third_party/WebKit/Source/platform/blob/BlobData.h
index 4e6aa56e8e887dbd2e7bc8a3c41879400f0531fd..0c2a6eac281ad6219d8be6e2946557e84c1c706d 100644
--- a/third_party/WebKit/Source/platform/blob/BlobData.h
+++ b/third_party/WebKit/Source/platform/blob/BlobData.h
@@ -185,6 +185,10 @@ class PLATFORM_EXPORT BlobData {
   // determined.
   long long length() const;
 
+  bool isSingleUnknownSizeFile() const {
+    return m_fileComposition == FileCompositionStatus::SINGLE_UNKNOWN_SIZE_FILE;
+  }
+
  private:
   FRIEND_TEST_ALL_PREFIXES(BlobDataTest, Consolidation);
 
@@ -228,6 +232,8 @@ class PLATFORM_EXPORT BlobDataHandle
   String type() const { return m_type.isolatedCopy(); }
   unsigned long long size() const { return m_size; }
 
+  bool isSingleUnknownSizeFile() const { return m_isSingleUnknownSizeFile; }
+
   ~BlobDataHandle();
 
  private:
@@ -238,6 +244,7 @@ class PLATFORM_EXPORT BlobDataHandle
   const String m_uuid;
   const String m_type;
   const long long m_size;
+  const bool m_isSingleUnknownSizeFile;
 };
 
 }  // namespace blink