feat(compiler): implement style encapsulation for new view engine (#14518)

Included refactoring:
- splits the `RendererV2` into a `RendererFactoryV2` and a `RendererV2`
- makes the `DebugRendererV2` a private class in `@angular/core`
- remove `setBindingDebugInfo` from `RendererV2`, but rename `RendererV2.setText` to 
  `RendererV2.setValue` and allow it on comments and text nodes.

Part of #14013

modules/@angular/compiler/src/view_compiler/compile_view.ts

@@ -7,7 +7,7 @@
  */
 
 import {AnimationEntryCompileResult} from '../animation/animation_compiler';
-import {CompileDirectiveMetadata, CompilePipeSummary, tokenName, viewClassName} from '../compile_metadata';
+import {CompileDirectiveMetadata, CompilePipeSummary, componentRenderTypeName, tokenName, viewClassName} from '../compile_metadata';
 import {EventHandlerVars, LegacyNameResolver} from '../compiler_util/expression_converter';
 import {CompilerConfig} from '../config';
 import {isPresent} from '../facade/lang';
@@ -70,6 +70,7 @@ export class CompileView implements LegacyNameResolver {
   public pipes: CompilePipe[] = [];
   public locals = new Map<string, o.Expression>();
   public className: string;
+  public renderComponentTypeName: string;
   public classType: o.Type;
   public classExpr: o.ReadVarExpr;
 
@@ -102,6 +103,7 @@ export class CompileView implements LegacyNameResolver {
 
     this.viewType = getViewType(component, viewIndex);
     this.className = viewClassName(component.type.reference, viewIndex);
+    this.renderComponentTypeName = componentRenderTypeName(component.type.reference);
     this.classType = o.expressionType(o.variable(this.className));
     this.classExpr = o.variable(this.className);
     if (this.viewType === ViewType.COMPONENT || this.viewType === ViewType.HOST) {

modules/@angular/compiler/src/view_compiler/view_builder.ts

@@ -386,7 +386,7 @@ function createViewTopLevelStmts(view: CompileView, targetStatements: o.Statemen
 
 
   const renderCompTypeVar: o.ReadVarExpr =
-      o.variable(`renderType_${identifierName(view.component.type)}`);  // fix highlighting: `
+      o.variable(view.renderComponentTypeName);  // fix highlighting: `
   if (view.viewIndex === 0) {
     let templateUrlInfo: string;
     if (view.component.template.templateUrl == identifierModuleUrl(view.component.type)) {

modules/@angular/compiler/src/view_compiler/view_compiler.ts

@@ -25,6 +25,7 @@ export {ComponentFactoryDependency, ComponentViewDependency, DirectiveWrapperDep
 export class ViewCompileResult {
   constructor(
       public statements: o.Statement[], public viewClassVar: string,
+      public componentRenderTypeVar: string,
       public dependencies:
           Array<ComponentViewDependency|ComponentFactoryDependency|DirectiveWrapperDependency>) {}
 }
@@ -50,6 +51,7 @@ export class ViewCompiler {
     bindView(view, template, this._schemaRegistry);
     finishView(view, statements);
 
-    return new ViewCompileResult(statements, view.classExpr.name, dependencies);
+    return new ViewCompileResult(
+        statements, view.classExpr.name, view.renderComponentTypeName, dependencies);
   }
 }