Serialize prototype and instance type instead of implicit prototype

Ambiguation needs to access a class's prototype to know the owner type of its member functions, and needs to know instance type and prototypes of constructors that are never explicitly new'd in the AST

PiperOrigin-RevId: 325901890

Author: lauraharker

src/com/google/javascript/jscomp/colors/ObjectColor.java

@@ -18,6 +18,7 @@
 
 import com.google.auto.value.AutoValue;
 import com.google.common.collect.ImmutableCollection;
+import javax.annotation.Nullable;
 
 /**
  * A user-defined object type. For now each type is defined by a unique class name and file source.
@@ -49,6 +50,13 @@ public ImmutableCollection<Color> getAlternates() {
 
   public abstract String getFilename();
 
+  // given `function Foo() {}` or `class Foo {}`, color of Foo.prototype. null otherwise.
+  @Nullable
+  public abstract Color getPrototype();
+
+  @Nullable
+  public abstract Color getInstanceColor();
+
   @Override
   public abstract boolean isInvalidating();
 
@@ -61,6 +69,10 @@ public abstract static class Builder {
 
     public abstract Builder setInvalidating(boolean value);
 
+    public abstract Builder setPrototype(Color prototype);
+
+    public abstract Builder setInstanceColor(Color instanceColor);
+
     public abstract ObjectColor build();
   }