Import Dart bindings as of Blink r188698. This merely copies the files over and does not attach any…

sky/engine/bindings-dart/core/dart/shared_lib/DartNativeExtensions.cpp

Index: sky/engine/bindings-dart/core/dart/shared_lib/DartNativeExtensions.cpp
diff --git a/sky/engine/platform/TestingPlatformSupport.cpp b/sky/engine/bindings-dart/core/dart/shared_lib/DartNativeExtensions.cpp
similarity index 53%
copy from sky/engine/platform/TestingPlatformSupport.cpp
copy to sky/engine/bindings-dart/core/dart/shared_lib/DartNativeExtensions.cpp
index d16f3bbce3f8c6e19075236339b1707fb52364af..742722d49681e665f325c38d61ee36a5a12e3b29 100644
--- a/sky/engine/platform/TestingPlatformSupport.cpp
+++ b/sky/engine/bindings-dart/core/dart/shared_lib/DartNativeExtensions.cpp
@@ -28,62 +28,56 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "sky/engine/config.h"
+#include "config.h"
 
-#include "sky/engine/platform/TestingPlatformSupport.h"
+#include "bindings/core/dart/shared_lib/DartNativeExtensions.h"
+
+#include "bindings/core/dart/DartUtilities.h"
 
 namespace blink {
 
-TestingDiscardableMemory::TestingDiscardableMemory(size_t size) : m_data(size), m_isLocked(true)
+#if defined(ENABLE_DART_NATIVE_EXTENSIONS)
+Dart_Handle DartNativeExtensions::loadExtension(const String& url, Dart_Handle parentLibrary)
 {
-}
+    String userUri = url.substring(String("dart-ext:").length());
 
-TestingDiscardableMemory::~TestingDiscardableMemory()
-{
-}
+    String name;
+    String path;
+    size_t index = userUri.reverseFind('/');
+    if (index == kNotFound) {
+        name = userUri;
+        path = "./";
+    } else if (index == userUri.length() - 1) {
+        return Dart_NewApiError("Extension name missing.");
+    } else {
+        name = userUri.substring(index + 1);
+        path = userUri.substring(0, index + 1);
+    }
 
-bool TestingDiscardableMemory::lock()
-{
-    ASSERT(!m_isLocked);
-    m_isLocked = true;
-    return false;
-}
+    void* libraryHandle = 0;
+    Dart_Handle result = loadExtensionLibrary(path, name, &libraryHandle);
+    if (Dart_IsError(result)) {
+        return result;
+    }
 
-void* TestingDiscardableMemory::data()
-{
-    ASSERT(m_isLocked);
-    return m_data.data();
-}
+    String initFunctionName = name + "_Init";
 
-void TestingDiscardableMemory::unlock()
-{
-    ASSERT(m_isLocked);
-    m_isLocked = false;
-    // Force eviction to catch clients not correctly checking the return value of lock().
-    memset(m_data.data(), 0, m_data.size());
-}
+    typedef Dart_Handle (*InitFunctionType)(Dart_Handle library);
+    InitFunctionType fn;
+    result = resolveSymbol(libraryHandle, initFunctionName, reinterpret_cast<void**>(&fn));
+    if (Dart_IsError(result)) {
+        return result;
+    }
 
-TestingPlatformSupport::TestingPlatformSupport(const Config& config)
-    : m_config(config)
-    , m_oldPlatform(blink::Platform::current())
-{
-    blink::Platform::initialize(this);
+    return (*fn)(parentLibrary);
 }
-
-TestingPlatformSupport::~TestingPlatformSupport()
+#else
+Dart_Handle DartNativeExtensions::loadExtension(const String& url, Dart_Handle parentLibrary)
 {
-    blink::Platform::initialize(m_oldPlatform);
+    return Dart_NewApiError("Native extensions are not enabled.");
 }
+#endif // defined(ENABLE_DART_NATIVE_EXTENSIONS)
 
-blink::WebDiscardableMemory* TestingPlatformSupport::allocateAndLockDiscardableMemory(size_t bytes)
-{
-    return !m_config.hasDiscardableMemorySupport ? 0 : new TestingDiscardableMemory(bytes);
 }
 
-const unsigned char* TestingPlatformSupport::getTraceCategoryEnabledFlag(const char* categoryName)
-{
-    static const unsigned char tracingIsDisabled = 0;
-    return &tracingIsDisabled;
-}
 
-} // namespace blink