Split out libplatform into a separate libary

tools/gyp/v8.gyp

Index: tools/gyp/v8.gyp
diff --git a/tools/gyp/v8.gyp b/tools/gyp/v8.gyp
index c455c1f33dd473d4560d326253118a4abdac70bc..3fabc257889f38d69c88f786cee08f72a344bb6d 100644
--- a/tools/gyp/v8.gyp
+++ b/tools/gyp/v8.gyp
@@ -532,13 +532,6 @@
         '../../src/jsregexp-inl.h',
         '../../src/jsregexp.cc',
         '../../src/jsregexp.h',
-        # TODO(jochen): move libplatform/ files to their own target.
-        '../../src/libplatform/default-platform.cc',
-        '../../src/libplatform/default-platform.h',
-        '../../src/libplatform/task-queue.cc',
-        '../../src/libplatform/task-queue.h',
-        '../../src/libplatform/worker-thread.cc',
-        '../../src/libplatform/worker-thread.h',
         '../../src/list-inl.h',
         '../../src/list.h',
         '../../src/lithium-allocator-inl.h',
@@ -1209,6 +1202,41 @@
       ],
     },
     {
+      'target_name': 'v8_libplatform',
+      'type': 'static_library',
+      'variables': {
+        'optimize': 'max',
+      },
+      'dependencies': [
+        'v8_libbase',
+      ],
+      'include_dirs+': [
+        '../..',
+      ],
+      'sources': [
+        '../../include/libplatform/libplatform.h',
+        '../../src/libplatform/default-platform.cc',
+        '../../src/libplatform/default-platform.h',
+        '../../src/libplatform/task-queue.cc',
+        '../../src/libplatform/task-queue.h',
+        '../../src/libplatform/worker-thread.cc',
+        '../../src/libplatform/worker-thread.h',
+      ],
+      'conditions': [
+        ['want_separate_host_toolset==1', {
+          'toolsets': ['host', 'target'],
+        }, {
+          'toolsets': ['target'],
+        }],
+        ['component=="shared_library"', {
+          'defines': [
+            'BUILDING_V8_SHARED',
+            'V8_SHARED',
+          ],
+        }],
+      ],
+    },
+    {
       'target_name': 'natives_blob',
       'type': 'none',
       'conditions': [
@@ -1382,7 +1410,7 @@
     {
       'target_name': 'mksnapshot',
       'type': 'executable',
-      'dependencies': ['v8_base', 'v8_nosnapshot'],
+      'dependencies': ['v8_base', 'v8_nosnapshot', 'v8_libplatform'],
       'include_dirs+': [
         '../..',
       ],