refactor(platform-browser): move platform-browser/animations to animations/browser (#15130)

Closes: #15130

packages/animations/browser/src/dsl/animation_transition_instruction.ts

@@ -0,0 +1,36 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+import {ɵStyleData} from '@angular/animations';
+import {AnimationEngineInstruction, AnimationTransitionInstructionType} from '../render/animation_engine_instruction';
+import {AnimationTimelineInstruction} from './animation_timeline_instruction';
+
+export interface AnimationTransitionInstruction extends AnimationEngineInstruction {
+  triggerName: string;
+  isRemovalTransition: boolean;
+  fromState: string;
+  fromStyles: ɵStyleData;
+  toState: string;
+  toStyles: ɵStyleData;
+  timelines: AnimationTimelineInstruction[];
+}
+
+export function createTransitionInstruction(
+    triggerName: string, fromState: string, toState: string, isRemovalTransition: boolean,
+    fromStyles: ɵStyleData, toStyles: ɵStyleData,
+    timelines: AnimationTimelineInstruction[]): AnimationTransitionInstruction {
+  return {
+    type: AnimationTransitionInstructionType.TransitionAnimation,
+    triggerName,
+    isRemovalTransition,
+    fromState,
+    fromStyles,
+    toState,
+    toStyles,
+    timelines
+  };
+}