Add DevTools protocol to generate test report.

This protocol will be use to implement the WebDriver Extension
Command specced here:
https://w3c.github.io/reporting/#generate-test-report-command

Change-Id: Idfe7fc40bc85589b1fc6e79f2d603ed01cf78840
Reviewed-on: https://chromium-review.googlesource.com/1188754Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Commit-Queue: Paul Meyer <paulmeyer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586391}

third_party/WebKit/LayoutTests/inspector-protocol/page/generate-test-report-expected.txt

+Tests that Page.generateTestReport works for main frame.
+
+>> GENERATING TEST REPORT <<
+
+Reports: 1
+Report Type: test
+Good URL: true
+Report Message: "Test message 42."
+DONE
+

third_party/WebKit/LayoutTests/inspector-protocol/page/generate-test-report.js

+(async function(testRunner) {
+  const {page, session, dp} = await testRunner.startBlank(
+      "Tests that Page.generateTestReport works for main frame.");
+
+  await session.evaluate(`var observer = new ReportingObserver(function(reports, observer) {
+    window.console.log("Reports: " + reports.length);
+
+    // Ensure that the contents of the report are valid.
+    window.console.log("Report Type: " + reports[0].type);
+    window.console.log("Good URL: " + reports[0].url.endsWith("inspector-protocol-page.html"));
+    window.console.log("Report Message: \\"" + reports[0].body.message + "\\"");
+    window.console.log("DONE");
+  });`);
+  await session.evaluate(`observer.observe()`);
+
+  await dp.Page.enable();
+  await dp.Runtime.enable();
+  testRunner.log("\n>> GENERATING TEST REPORT <<\n");
+  await dp.Page.generateTestReport({ message: "Test message 42." });
+
+  dp.Runtime.onConsoleAPICalled(result => {
+    testRunner.log(result.params.args[0].value);
+    if (result.params.args[0].value === 'DONE')
+      testRunner.completeTest();
+  });
+})

third_party/blink/renderer/core/core_idl_files.gni

@@ -187,6 +187,7 @@ core_idl_files =
                     "frame/report.idl",
                     "frame/report_body.idl",
                     "frame/reporting_observer.idl",
+                    "frame/test_report_body.idl",
                     "frame/user_activation.idl",
                     "frame/visual_viewport.idl",
                     "geometry/dom_matrix.idl",

third_party/blink/renderer/core/frame/BUILD.gn

@@ -159,6 +159,7 @@ blink_core_sources("frame") {
     "settings_delegate.h",
     "smart_clip.cc",
     "smart_clip.h",
+    "test_report_body.h",
     "use_counter.cc",
     "use_counter.h",
     "user_activation.cc",

third_party/blink/renderer/core/frame/reporting_context.cc

@@ -53,7 +53,6 @@ void ReportingContext::CountReport(Report* report) {
   } else if (type == "intervention") {
     feature = WebFeature::kInterventionReport;
   } else {
-    NOTREACHED();
     return;
   }
 

third_party/blink/renderer/core/frame/test_report_body.h

+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_TEST_REPORT_BODY_H_
+#define THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_TEST_REPORT_BODY_H_
+
+#include "third_party/blink/renderer/core/frame/report_body.h"
+
+namespace blink {
+
+class TestReportBody : public ReportBody {
+  DEFINE_WRAPPERTYPEINFO();
+
+ public:
+  TestReportBody(const String& message) : message_(message) {}
+
+  ~TestReportBody() override = default;
+
+  String message() const { return message_; }
+
+ private:
+  const String message_;
+};
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_TEST_REPORT_BODY_H_

third_party/blink/renderer/core/frame/test_report_body.idl

+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// https://w3c.github.io/reporting/#test-report
+
+[
+    NoInterfaceObject,
+    RuntimeEnabled=TestReporting
+] interface TestReportBody : ReportBody {
+  readonly attribute DOMString message;
+};

third_party/blink/renderer/core/inspector/browser_protocol.pdl

@@ -5276,6 +5276,14 @@ domain Page
   # Clears seeded compilation cache.
   experimental command clearCompilationCache
 
+  # Generates a report for testing.
+  experimental command generateTestReport
+    parameters
+      # Message to be displayed in the report.
+      string message
+      # Specifies the endpoint group to deliver the report to.
+      optional string group
+
   event domContentEventFired
     parameters
       Network.MonotonicTime timestamp

third_party/blink/renderer/core/inspector/inspector_page_agent.cc

@@ -43,7 +43,10 @@
 #include "third_party/blink/renderer/core/frame/local_frame.h"
 #include "third_party/blink/renderer/core/frame/local_frame_client.h"
 #include "third_party/blink/renderer/core/frame/local_frame_view.h"
+#include "third_party/blink/renderer/core/frame/report.h"
+#include "third_party/blink/renderer/core/frame/reporting_context.h"
 #include "third_party/blink/renderer/core/frame/settings.h"
+#include "third_party/blink/renderer/core/frame/test_report_body.h"
 #include "third_party/blink/renderer/core/frame/visual_viewport.h"
 #include "third_party/blink/renderer/core/html/html_frame_owner_element.h"
 #include "third_party/blink/renderer/core/html/imports/html_import_loader.h"
@@ -1302,6 +1305,20 @@ Response InspectorPageAgent::clearCompilationCache() {
   return Response::OK();
 }
 
+protocol::Response InspectorPageAgent::generateTestReport(const String& message,
+                                                          Maybe<String> group) {
+  Document* document = inspected_frames_->Root()->GetDocument();
+
+  // Construct the test report.
+  TestReportBody* body = new TestReportBody(message);
+  Report* report = new Report("test", document->Url().GetString(), body);
+
+  // Send the test report to any ReportingObservers.
+  ReportingContext::From(document)->QueueReport(report);
+
+  return Response::OK();
+}
+
 void InspectorPageAgent::Trace(blink::Visitor* visitor) {
   visitor->Trace(inspected_frames_);
   visitor->Trace(inspector_resource_content_loader_);

third_party/blink/renderer/core/inspector/inspector_page_agent.h

@@ -158,6 +158,8 @@ class CORE_EXPORT InspectorPageAgent final
       std::unique_ptr<protocol::Page::FontFamilies>) override;
   protocol::Response setFontSizes(
       std::unique_ptr<protocol::Page::FontSizes>) override;
+  protocol::Response generateTestReport(const String& message,
+                                        Maybe<String> group) override;
 
   protocol::Response setProduceCompilationCache(bool enabled) override;
   protocol::Response addCompilationCache(const String& url,

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -1158,6 +1158,10 @@
       origin_trial_feature_name: "StaleWhileRevalidate",
       status: "experimental",
     },
+    {
+      name: "TestReporting",
+      status: "test",
+    },
     {
       name: "TextUnderlinePositionLeftRight",
       status: "experimental",