Make JavaScriptBackend.processAnnotations element-model agnostic

pkg/compiler/lib/src/inferrer/inferrer_engine.dart

Index: pkg/compiler/lib/src/inferrer/inferrer_engine.dart
diff --git a/pkg/compiler/lib/src/inferrer/inferrer_engine.dart b/pkg/compiler/lib/src/inferrer/inferrer_engine.dart
index 152f2f4e23d29d89175aa71889a9d1eb3ecec486..ca21ba8bbe3153668f82dd167a87a6ab19446e25 100644
--- a/pkg/compiler/lib/src/inferrer/inferrer_engine.dart
+++ b/pkg/compiler/lib/src/inferrer/inferrer_engine.dart
@@ -85,6 +85,17 @@ class InferrerEngine {
 
   CommonElements get commonElements => closedWorld.commonElements;
 
+  /// Returns `true` if [element] has an `@AssumeDynamic()` annotation.
+  bool assumeDynamic(Element element) {
+    return element is MemberElement && optimizerHints.assumeDynamic(element);
+  }
+
+  /// Returns `true` if [element] has an `@TrustTypeAnnotations()` annotation.
+  bool trustTypeAnnotations(Element element) {
+    return element is MemberElement &&
+        optimizerHints.trustTypeAnnotations(element);
+  }
+
   /**
    * Applies [f] to all elements in the universe that match
    * [selector] and [mask]. If [f] returns false, aborts the iteration.
@@ -226,7 +237,7 @@ class InferrerEngine {
   }
 
   JavaScriptBackend get backend => compiler.backend;
-  OptimizerHintsForTests get annotations => backend.annotations;
+  OptimizerHintsForTests get optimizerHints => backend.optimizerHints;
   DiagnosticReporter get reporter => compiler.reporter;
   CommonMasks get commonMasks => closedWorld.commonMasks;