[ffi] Add missing changelog entries for dart:ffi

Includes changelog additions and `@Since` version fixes for https://dart-review.googlesource.com/c/sdk/+/349260.

CoreLibraryReviewExempt: No functional change and dart:ffi is only supported by the VM and dart2wasm.
Change-Id: Iad0c4d3686278312715ec5fc5374b3c983b71d1e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/349765
Reviewed-by: Daco Harkes <dacoharkes@google.com>
Reviewed-by: Slava Egorov <vegorov@google.com>
Auto-Submit: Parker Lougheed <parlough@gmail.com>
Commit-Queue: Daco Harkes <dacoharkes@google.com>

CHANGELOG.md

@@ -23,6 +23,11 @@
 
 ### Libraries
 
+#### `dart:ffi`
+
+- Added `Struct.create` and `Union.create` to create struct and union views
+  of the sequence of bytes stored in a subtype of `TypedData`.
+
 #### `dart:js_interop`
 
 - On dart2wasm, `JSBoxedDartObject` now is an actual JS object that wraps the
@@ -97,6 +102,11 @@
 - In addition to functions, `@Native` can now be used on fields.
 - Allow taking the address of native functions and fields via
   `Native.addressOf`.
+- The `elementAt` pointer arithmetic extension methods on
+  core `Pointer` types are now deprecated.
+  Migrate to the new `-` and `+` operators instead.
+- The experimental and deprecated `@FfiNative` annotation has been removed.
+  Usages should be updated to use the `@Native` annotation.
 
 #### `dart:js_interop`
 
@@ -380,6 +390,8 @@ constraint][language version] lower bound to 3.2 or greater (`sdk: '^3.2.0'`).
   error if is called after the `NativeCallable` has already been `close`d. Calls
   to `close` after the first are now ignored.
 
+[#53311]: https://github.com/dart-lang/sdk/issues/53311
+
 #### `dart:io`
 
 - **Breaking change** [#53005][]: The headers returned by
@@ -1123,6 +1135,11 @@ constraint][language version] lower bound to 3.0 or greater (`sdk: '^3.0.0'`).
 [`Counter`]: https://api.dart.dev/stable/2.18.2/dart-developer/Counter-class.html
 [`Gauge`]: https://api.dart.dev/stable/2.18.2/dart-developer/Gauge-class.html
 
+#### `dart:ffi`
+
+- The experimental `@FfiNative` annotation is now deprecated.
+  Usages should be replaced with the new `@Native` annotation.
+
 #### `dart:html`
 
 - **Breaking change**: As previously announced, the deprecated `registerElement`

sdk/lib/ffi/struct.dart

@@ -112,7 +112,7 @@ abstract base class Struct extends _Compound {
   /// bytes for the [sizeOf] of the created struct, is allocated on the Dart
   /// heap, and used as memory to store the struct fields.
   ///
-  /// If [offset] is provded, the indexing into [typedData] is offset by
+  /// If [offset] is provided, the indexing into [typedData] is offset by
   /// [offset] times [TypedData.elementSizeInBytes].
   ///
   /// Example:
@@ -141,7 +141,7 @@ abstract base class Struct extends _Compound {
   /// ```
   ///
   /// To create a struct object from a [Pointer], use [StructPointer.ref].
-  @Since('3.3')
+  @Since('3.4')
   external static T create<T extends Struct>([TypedData typedData, int offset]);
 
   /// Creates a view on a [TypedData] or [Pointer].

sdk/lib/ffi/union.dart

@@ -77,7 +77,7 @@ abstract base class Union extends _Compound {
   /// bytes for the [sizeOf] of the created union, is allocated on the Dart
   /// heap, and used as memory to store the union fields.
   ///
-  /// If [offset] is provded, the indexing into [typedData] is offset by
+  /// If [offset] is provided, the indexing into [typedData] is offset by
   /// [offset] times [TypedData.elementSizeInBytes].
   ///
   /// Example:
@@ -110,7 +110,7 @@ abstract base class Union extends _Compound {
   /// ```
   ///
   /// To create a union object from a [Pointer], use [UnionPointer.ref].
-  @Since('3.3')
+  @Since('3.4')
   external static T create<T extends Union>([TypedData typedData, int offset]);
 
   /// Creates a view on a [TypedData] or [Pointer].