VM: Split GYP build target 'runtime' to speedup SDK build times.

dart.gyp

Index: dart.gyp
diff --git a/dart.gyp b/dart.gyp
index 4a6a2f8191defe088f2cfb10c50e8e723e9de5e9..b942371e3114f344a89941bcb0f1226b95e2e66b 100644
--- a/dart.gyp
+++ b/dart.gyp
@@ -26,9 +26,36 @@
       'type': 'none',
       'dependencies': [
         'runtime/dart-runtime.gyp:dart',
-        'runtime/dart-runtime.gyp:dart_noopt',
+        'runtime/dart-runtime.gyp:dart_bootstrap#host',
+        'runtime/dart-runtime.gyp:run_vm_tests',
+        'runtime/dart-runtime.gyp:process_test',
+        'packages',
+        'runtime/dart-runtime.gyp:test_extension',
+        'runtime/dart-runtime.gyp:sample_extension',
+      ],
+    },
+    {
+      # This is the target that is built on the VM build bots.  It
+      # must depend on anything that is required by the VM test
+      # suites.
+      'target_name': 'runtime_precompiled',
+      'type': 'none',
+      'dependencies': [
         'runtime/dart-runtime.gyp:dart_precompiled_runtime',
         'runtime/dart-runtime.gyp:dart_bootstrap#host',
+        'packages',
+      ],
+    },
+    {
+      # This is the target that is built on the VM build bots.  It
+      # must depend on anything that is required by the VM test
+      # suites.
+      'target_name': 'runtime_and_noopt',
+      'type': 'none',
+      'dependencies': [
+        'runtime/dart-runtime.gyp:dart',
+        'runtime/dart-runtime.gyp:dart_noopt',
+        'runtime/dart-runtime.gyp:dart_bootstrap#host',
         'runtime/dart-runtime.gyp:run_vm_tests',
         'runtime/dart-runtime.gyp:process_test',
         'packages',