Add thread-per-core setting to SkThreadPool.

tests/skia_test.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCommandLineFlags.h"
 #include "SkGraphics.h"
 #include "SkRunnable.h"
@@ skipping 123 matching lines @@
 const SkString& Test::GetResourcePath() {
     return gResourcePath;
 }
 
 DEFINE_string2(match, m, NULL, "substring of test name to run.");
 DEFINE_string2(tmpDir, t, NULL, "tmp directory for tests to use.");
 DEFINE_string2(resourcePath, i, NULL, "directory for test resources.");
 DEFINE_bool2(extendedTest, x, false, "run extended tests for pathOps.");
 DEFINE_bool2(threaded, z, false, "allow tests to use multiple threads internally.");
 DEFINE_bool2(verbose, v, false, "enable verbose output.");
-DEFINE_int32(threads, 8,
-             "If >0, run threadsafe tests on a threadpool with this many threads.");
+DEFINE_int32(threads, SkThreadPool::kThreadPerCore,
+             "Run threadsafe tests on a threadpool with this many threads.");
 
 // Deletes self when run.
 class SkTestRunnable : public SkRunnable {
 public:
   // Takes ownership of test.
   SkTestRunnable(Test* test, int32_t* failCount) : fTest(test), fFailCount(failCount) {}
 
   virtual void run() {
       fTest->run();
       if(!fTest->passed()) {
@@ skipping 98 matching lines @@
     GpuTest::DestroyContexts();
 
     return (failCount == 0) ? 0 : 1;
 }
 
 #if !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_NACL)
 int main(int argc, char * const argv[]) {
     return tool_main(argc, (char**) argv);
 }
 #endif