[WIP] Speculatively launch Service Workers on mouse/touch events.

content/browser/service_worker/service_worker_context_wrapper.cc

Index: content/browser/service_worker/service_worker_context_wrapper.cc
diff --git a/content/browser/service_worker/service_worker_context_wrapper.cc b/content/browser/service_worker/service_worker_context_wrapper.cc
index a289fdfa3e12c0196da39b17499d7e5d76ce2ce3..1b6b180cd985fe5b8100de351a92b5c15dc33c4b 100644
--- a/content/browser/service_worker/service_worker_context_wrapper.cc
+++ b/content/browser/service_worker/service_worker_context_wrapper.cc
@@ -20,6 +20,7 @@
 #include "base/single_thread_task_runner.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/threading/thread_task_runner_handle.h"
+#include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/service_worker/service_worker_context_core.h"
 #include "content/browser/service_worker/service_worker_context_observer.h"
 #include "content/browser/service_worker/service_worker_process_manager.h"
@@ -29,9 +30,11 @@
 #include "content/common/service_worker/service_worker_utils.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
+#include "content/public/browser/render_process_host.h"
 #include "net/base/url_util.h"
 #include "storage/browser/quota/quota_manager_proxy.h"
 #include "storage/browser/quota/special_storage_policy.h"
+#include "third_party/WebKit/public/platform/WebNavigationHintType.h"
 
 namespace content {
 
@@ -81,6 +84,39 @@ void SkipWaitingWorkerOnIO(
   registration->ActivateWaitingVersionWhenReady();
 }
 
+ServiceWorkerMetrics::EventType GetNavigationHintEventType(
+    blink::WebNavigationHintType type) {
+  switch (type) {
+    case blink::WebNavigationHintType::LinkMouseDown:
+      return ServiceWorkerMetrics::EventType::NAVIGATION_HINT_LINK_MOUSE_DOWN;
+    case blink::WebNavigationHintType::LinkTapUnconfirmed:
+      return ServiceWorkerMetrics::EventType::
+          NAVIGATION_HINT_LINK_TAP_UNCONFIRMED;
+    case blink::WebNavigationHintType::LinkTapDown:
+      return ServiceWorkerMetrics::EventType::NAVIGATION_HINT_LINK_TAP_DOWN;
+    default:
+      NOTREACHED() << "Unexpected navigation hint" << static_cast<int>(type);
+      return ServiceWorkerMetrics::EventType::UNKNOWN;
+  }
+}
+
+void CheckRenderProcessForNavigationHintOnUI(
+    const GURL& document_url,
+    int render_process_id,
+    const ServiceWorkerContext::ResultCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  RenderProcessHost* host = RenderProcessHost::FromID(render_process_id);
+  if (!host) {
+    BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+                            base::Bind(callback, false));
+    return;
+  }
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(callback, RenderProcessHostImpl::IsSuitableHost(
+                               host, host->GetBrowserContext(), document_url)));
+}
+
 }  // namespace
 
 void ServiceWorkerContext::AddExcludedHeadersForFetchEvent(
@@ -282,6 +318,77 @@ void ServiceWorkerContextWrapper::UpdateRegistration(const GURL& pattern) {
                  this));
 }
 
+void ServiceWorkerContextWrapper::StartServiceWorkerForNavigationHint(
+    const GURL& document_url,
+    blink::WebNavigationHintType type,
+    int render_process_id,
+    const ResultCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(
+          &CheckRenderProcessForNavigationHintOnUI, document_url,
+          render_process_id,
+          base::Bind(&ServiceWorkerContextWrapper::
+                         DidCheckRenderProcessForNavigationHint,
+                     this, document_url, type, render_process_id, callback)));
+}
+
+void ServiceWorkerContextWrapper::DidCheckRenderProcessForNavigationHint(
+    const GURL& document_url,
+    blink::WebNavigationHintType type,
+    int render_process_id,
+    const ResultCallback& callback,
+    bool result) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  if (!result || !context_core_) {
+    BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+                            base::Bind(callback, false));
+    return;
+  }
+  context_core_->storage()->FindRegistrationForDocument(
+      document_url,
+      base::Bind(
+          &ServiceWorkerContextWrapper::DidFindRegistrationForNavigationHint,
+          this, type, render_process_id, callback));
+}
+
+void ServiceWorkerContextWrapper::DidFindRegistrationForNavigationHint(
+    blink::WebNavigationHintType type,
+    int render_process_id,
+    const ResultCallback& callback,
+    ServiceWorkerStatusCode status,
+    const scoped_refptr<ServiceWorkerRegistration>& registration) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  if (status != SERVICE_WORKER_OK || !registration->active_version()) {
+    BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+                            base::Bind(callback, false));
+    return;
+  }
+
+  context_core_->process_manager()->AddProcessReferenceToPattern(
+      registration->pattern(), render_process_id);
+
+  registration->active_version()->StartWorker(
+      GetNavigationHintEventType(type),
+      base::Bind(
+          &ServiceWorkerContextWrapper::DidStartServiceWorkerForNavigationHint,
+          this, registration->pattern(), render_process_id, callback));
+}
+
+void ServiceWorkerContextWrapper::DidStartServiceWorkerForNavigationHint(
+    const GURL& pattern,
+    int render_process_id,
+    const ResultCallback& callback,
+    ServiceWorkerStatusCode code) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  context_core_->process_manager()->RemoveProcessReferenceFromPattern(
+      pattern, render_process_id);
+  BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+                          base::Bind(callback, code == SERVICE_WORKER_OK));
+}
+
 void ServiceWorkerContextWrapper::StartServiceWorker(
     const GURL& pattern,
     const StatusCallback& callback) {