Declarative resource hints go through mojo IPC to //content

third_party/WebKit/Source/platform/exported/Platform.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "platform/Histogram.h"
 #include "platform/MemoryCacheDumpProvider.h"
 #include "platform/PartitionAllocMemoryDumpProvider.h"
+#include "platform/PlatformMojoInterface.h"
 #include "platform/fonts/FontCacheMemoryDumpProvider.h"
 #include "platform/graphics/CompositorFactory.h"
 #include "platform/heap/BlinkGCMemoryDumpProvider.h"
 #include "platform/heap/GCTaskRunner.h"
 #include "public/platform/Platform.h"
 #include "public/platform/ServiceRegistry.h"
 #include "public/platform/WebPrerenderingSupport.h"
+#include "public/platform/WebPrescientNetworking.h"
 #include "wtf/HashMap.h"
 #include "wtf/OwnPtr.h"
 
 namespace blink {
 
 static Platform* s_platform = nullptr;
 
 static GCTaskRunner* s_gcTaskRunner = nullptr;
 
 Platform::Platform()
     : m_mainThread(0)
+    , m_mojoInterface(nullptr)

[kinuko, 2016/06/16 05:39:58]

shouldn't need this

[Charlie Harrison, 2016/06/16 11:00:20]

Done.

 {
 }
 
+Platform::~Platform()

[kinuko, 2016/06/16 05:39:58]

= default works?

[Charlie Harrison, 2016/06/16 11:00:20]

Done.

+{
+}
+
 static void maxObservedSizeFunction(size_t sizeInMB)
 {
     const size_t supportedMaxSizeInMB = 4 * 1024;
     if (sizeInMB >= supportedMaxSizeInMB)
         sizeInMB = supportedMaxSizeInMB - 1;
 
     // Send a UseCounter only when we see the highest memory usage
     // we've ever seen.
     DEFINE_STATIC_LOCAL(EnumerationHistogram, committedSizeHistogram, ("PartitionAlloc.CommittedSize", supportedMaxSizeInMB));
     committedSizeHistogram.count(sizeInMB);
@@ skipping 23 matching lines @@
     // TODO(ssid): remove this check after fixing crbug.com/486782.
     if (s_platform->m_mainThread) {
         ASSERT(!s_gcTaskRunner);
         s_gcTaskRunner = new GCTaskRunner(s_platform->m_mainThread);
         base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(PartitionAllocMemoryDumpProvider::instance(), "PartitionAlloc", base::ThreadTaskRunnerHandle::Get());
         base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(FontCacheMemoryDumpProvider::instance(), "FontCaches", base::ThreadTaskRunnerHandle::Get());
         base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(MemoryCacheDumpProvider::instance(), "MemoryCache", base::ThreadTaskRunnerHandle::Get());
     }
 
     CompositorFactory::initializeDefault();
+    s_platform->m_mojoInterface.reset(new PlatformMojoInterface);
 }
 
 void Platform::shutdown()

[kinuko, 2016/06/16 05:39:58]

should we clear mojoInterface here?

[Charlie Harrison, 2016/06/16 21:31:22]

Done.

 {
     ASSERT(isMainThread());
+
     CompositorFactory::shutdown();
 
     if (s_platform->m_mainThread) {
         base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(FontCacheMemoryDumpProvider::instance());
         base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(PartitionAllocMemoryDumpProvider::instance());
         base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(BlinkGCMemoryDumpProvider::instance());
         base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(MemoryCacheDumpProvider::instance());
 
         ASSERT(s_gcTaskRunner);
         delete s_gcTaskRunner;
@@ skipping 28 matching lines @@
 WebThread* Platform::mainThread() const
 {
     return m_mainThread;
 }
 
 ServiceRegistry* Platform::serviceRegistry()
 {
     return ServiceRegistry::getEmptyServiceRegistry();
 }
 
+void Platform::preconnect(const KURL& url, bool credentialsFlag, int numConnections)

[kinuko, 2016/06/16 05:39:58]

Do we need to expose methods for each of these?  Just expose mojoInterface would
be enough?

[Charlie Harrison, 2016/06/16 11:00:20]

SGTM. Done.

+{
+    m_mojoInterface->resourceHintsHandlerHost()->Preconnect(url, credentialsFlag, numConnections);
+}
+
+void Platform::preresolve(const KURL& url)
+{
+    m_mojoInterface->resourceHintsHandlerHost()->Preresolve(url);
+}
+
+void Platform::speculativePreresolve(const KURL& url)
+{
+    if (WebPrescientNetworking* prescientNetworking = Platform::current()->prescientNetworking())
+        prescientNetworking->prefetchDNS(url.host());
+}
+
 } // namespace blink