BASELINE: Update Chromium to 75.0.3770.56

Change-Id: I86d2007fd27a45d5797eee06f4c9369b8b50ac4f
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

1 files changed, 35 insertions, 0 deletions

diff --git a/chromium/media/base/unaligned_shared_memory.h b/chromium/media/base/unaligned_shared_memory.h
index b86961803c6..7e3cbbaef62 100644
--- a/chromium/media/base/unaligned_shared_memory.h
+++ b/chromium/media/base/unaligned_shared_memory.h
@@ -8,6 +8,7 @@
 #include <stdint.h>
 
 #include "base/macros.h"
+#include "base/memory/read_only_shared_memory_region.h"
 #include "base/memory/shared_memory.h"
 #include "base/memory/shared_memory_mapping.h"
 #include "base/memory/unsafe_shared_memory_region.h"
@@ -87,6 +88,40 @@ class MEDIA_EXPORT WritableUnalignedMapping {
   DISALLOW_COPY_AND_ASSIGN(WritableUnalignedMapping);
 };
 
+// Wrapper over base::ReadOnlySharedMemoryMapping that is mapped at unaligned
+// offsets.
+class MEDIA_EXPORT ReadOnlyUnalignedMapping {
+ public:
+  // Creates an |WritableUnalignedMapping| instance from a
+  // |ReadOnlySharedMemoryRegion|. |size| sets the maximum size that may be
+  // mapped within |region| and |offset| is the offset that will be mapped.
+  // |region| is not retained and is used only in the constructor.
+  ReadOnlyUnalignedMapping(const base::ReadOnlySharedMemoryRegion& region,
+                           size_t size,
+                           off_t offset);
+
+  ~ReadOnlyUnalignedMapping();
+
+  size_t size() const { return size_; }
+  const void* memory() const;
+
+  // True if the mapping backing the memory is valid.
+  bool IsValid() const { return mapping_.IsValid(); }
+
+ private:
+  base::ReadOnlySharedMemoryMapping mapping_;
+
+  // The size of the region associated with |mapping_|.
+  size_t size_;
+
+  // Difference between actual offset within |mapping_| where data has been
+  // mapped and requested offset; strictly less than
+  // base::SysInfo::VMAllocationGranularity().
+  size_t misalignment_;
+
+  DISALLOW_COPY_AND_ASSIGN(ReadOnlyUnalignedMapping);
+};
+
 }  // namespace media
 
 #endif  // MEDIA_BASE_UNALIGNED_SHARED_MEMORY_H_