DevTools: [JsDocValidator] Refactor JsDoc annotation checkers

Source/devtools/scripts/jsdoc-validator/src/org/chromium/devtools/jsdoc/checks/ContextTrackingChecker.java

Index: Source/devtools/scripts/jsdoc-validator/src/org/chromium/devtools/jsdoc/checks/ContextTrackingChecker.java
diff --git a/Source/devtools/scripts/jsdoc-validator/src/org/chromium/devtools/jsdoc/checks/ContextTrackingChecker.java b/Source/devtools/scripts/jsdoc-validator/src/org/chromium/devtools/jsdoc/checks/ContextTrackingChecker.java
new file mode 100644
index 0000000000000000000000000000000000000000..2cd5614b415fb66796bd0f781df10a1285308f63
--- /dev/null
+++ b/Source/devtools/scripts/jsdoc-validator/src/org/chromium/devtools/jsdoc/checks/ContextTrackingChecker.java
@@ -0,0 +1,25 @@
+package org.chromium.devtools.jsdoc.checks;
+
+import com.google.javascript.rhino.head.ast.AstNode;
+
+import org.chromium.devtools.jsdoc.ValidatorContext;
+
+abstract class ContextTrackingChecker {
+    private ContextTrackingState state;
+
+    abstract void enterNode(AstNode node);
+
+    abstract void leaveNode(AstNode node);
+
+    void setState(ContextTrackingState state) {
+        this.state = state;
+    }
+
+    protected ContextTrackingState getState() {
+        return state;
+    }
+
+    protected ValidatorContext getContext() {
+        return state.getContext();
+    }
+}