Expose platform thread id on WebThread

DevTools code needs access to platform thread id in order to collect Worker thread ids and based on them differentiate worker threads in recorded trace events.

BUG=401895

Review URL: https://codereview.chromium.org/514193002

git-svn-id: svn://svn.chromium.org/blink/trunk@181562 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/platform/WebThread.cpp

+// Copyright 2014 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.
+
+#include "config.h"
+#include "public/platform/WebThread.h"
+
+#include "wtf/Assertions.h"
+
+#if OS(WIN)
+#include <windows.h>
+#elif OS(POSIX)
+#include <unistd.h>
+#endif
+
+namespace {
+#if OS(WIN)
+COMPILE_ASSERT(sizeof(blink::PlatformThreadId) >= sizeof(DWORD), Size_of_platform_thread_id_is_too_small);
+#elif OS(POSIX)
+COMPILE_ASSERT(sizeof(blink::PlatformThreadId) >= sizeof(pid_t), Size_of_platform_thread_id_is_too_small);
+#else
+#error Unexpected platform
+#endif
+}

third_party/WebKit/Source/platform/blink_platform.gypi

@@ -141,6 +141,7 @@
       'URLPatternMatcher.h',
       'UUID.cpp',
       'UUID.h',
+      'WebThread.cpp',
       'Widget.cpp',
       'Widget.h',
       'WindowsKeyboardCodes.h',

third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurfaceTest.cpp

@@ -242,6 +242,11 @@ private:
         virtual void postDelayedTask(Task*, long long delayMs) OVERRIDE { ASSERT_NOT_REACHED(); };
 
         virtual bool isCurrentThread() const OVERRIDE { return true; }
+        virtual PlatformThreadId threadId() const OVERRIDE
+        {
+            ASSERT_NOT_REACHED();
+            return 0;
+        }
 
         virtual void addTaskObserver(TaskObserver* taskObserver) OVERRIDE
         {

third_party/WebKit/Source/platform/scheduler/SchedulerTest.cpp

@@ -37,6 +37,12 @@ public:
         return true;
     }
 
+    virtual blink::PlatformThreadId threadId() const OVERRIDE
+    {
+        ASSERT_NOT_REACHED();
+        return 0;
+    }
+
     virtual void enterRunLoop() OVERRIDE
     {
         ASSERT_NOT_REACHED();

third_party/WebKit/public/platform/WebThread.h

@@ -26,9 +26,13 @@
 #define WebThread_h
 
 #include "WebCommon.h"
+#include <stdint.h>
 
 namespace blink {
 
+// Always an integer value.
+typedef uintptr_t PlatformThreadId;
+
 // Provides an interface to an embedder-defined thread implementation.
 //
 // Deleting the thread blocks until all pending, non-delayed tasks have been
@@ -55,6 +59,7 @@ public:
     virtual void postDelayedTask(Task*, long long delayMs) = 0;
 
     virtual bool isCurrentThread() const = 0;
+    virtual PlatformThreadId threadId() const { return 0; }
 
     virtual void addTaskObserver(TaskObserver*) { }
     virtual void removeTaskObserver(TaskObserver*) { }