Re-land "Add methods to enable configuration of ResourceConstraints based on limits derived at..."

include/v8-defaults.h

Index: include/v8-defaults.h
diff --git a/test/cctest/test-cpu.cc b/include/v8-defaults.h
similarity index 71%
copy from test/cctest/test-cpu.cc
copy to include/v8-defaults.h
index 06966c68c86296e510edb8899f4d7deb0343f108..381a48210d1b9895fbda4e4c89eb0e51fa61b6d0 100644
--- a/test/cctest/test-cpu.cc
+++ b/include/v8-defaults.h
@@ -25,31 +25,30 @@
 // (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 "v8.h"
-
-#include "cctest.h"
-#include "cpu.h"
+#ifndef V8_V8_DEFAULTS_H_
+#define V8_V8_DEFAULTS_H_
 
-using namespace v8::internal;
+#include "v8.h"
 
+/**
+ * Default configuration support for the V8 JavaScript engine.
+ */
+namespace v8 {
 
-TEST(FeatureImplications) {
-  // Test for features implied by other features.
-  CPU cpu;
+/**
+ * Configures the constraints with reasonable default values based on the
+ * capabilities of the current device the VM is running on.
+ */
+bool V8_EXPORT ConfigureResourceConstraintsForCurrentPlatform(
+    ResourceConstraints* constraints);
 
-  // ia32 and x64 features
-  CHECK(!cpu.has_sse() || cpu.has_mmx());
-  CHECK(!cpu.has_sse2() || cpu.has_sse());
-  CHECK(!cpu.has_sse3() || cpu.has_sse2());
-  CHECK(!cpu.has_ssse3() || cpu.has_sse3());
-  CHECK(!cpu.has_sse41() || cpu.has_sse3());
-  CHECK(!cpu.has_sse42() || cpu.has_sse41());
 
-  // arm features
-  CHECK(!cpu.has_vfp3_d32() || cpu.has_vfp3());
-}
+/**
+ * Convience function which performs SetResourceConstraints with the settings
+ * returned by ConfigureResourceConstraintsForCurrentPlatform.
+ */
+bool V8_EXPORT SetDefaultResourceConstraintsForCurrentPlatform();
 
+}  // namespace v8
 
-TEST(NumberOfProcessorsOnline) {
-  CHECK_GT(CPU::NumberOfProcessorsOnline(), 0);
-}
+#endif  // V8_V8_DEFAULTS_H_