On Android uses system properties instead of environment variables.

Source/bindings/dart/DartController.cpp

 // Copyright (c) 2009, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 12 matching lines @@
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (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 "config.h"
 #include "bindings/dart/DartController.h"
 
+#if OS(ANDROID)
+#include <sys/system_properties.h>
+#endif
+
+
 #include "DartDocument.h"
 #include "DartWindow.h"
 #include "HTMLNames.h"
 #include "V8Navigator.h"
 #include "bindings/dart/DartApplicationLoader.h"
 #include "bindings/dart/DartAsyncLoader.h"
 #include "bindings/dart/DartDOMData.h"
 #include "bindings/dart/DartDOMWrapper.h"
 #include "bindings/dart/DartDebugServer.h"
 #include "bindings/dart/DartGCController.h"
@@ skipping 129 matching lines @@
     Dart_Handle core = Dart_LookupLibrary(Dart_NewStringFromCString("dart:core"));
     ASSERT(!Dart_IsError(core));
     Dart_LibraryImportLibrary(core, html, Dart_Null());
     domData->setCoreLibrary(Dart_NewPersistentHandle(core));
 
     Dart_Handle typedData = Dart_LookupLibrary(Dart_NewStringFromCString("dart:typed_data"));
     ASSERT(!Dart_IsError(typedData));
     domData->setTypedDataLibrary(Dart_NewPersistentHandle(typedData));
 
     // Setup configuration closures
-    const char * const printClosure = getenv("DART_FORWARDING_PRINT") ?
+#if OS(ANDROID)
+    char forwardingProperty[PROP_VALUE_MAX];
+    int propLen = __system_property_get("DART_FORWARDING_PRINT", &forwardingProperty[0]);
+    bool forwardPrint = propLen > 0;
+#else
+    bool forwardPrint = getenv("DART_FORWARDING_PRINT");
+#endif
+    const char * const printClosure = forwardPrint ?
         "_forwardingPrintClosure" :
         (isDOMEnabled ?  "_printClosure" : "_pureIsolatePrintClosure");
     copyValue(html, printClosure, "dart:_collection-dev", 0, "_printClosure");
     copyValue(html, isDOMEnabled ? "_timerFactoryClosure" : "_pureIsolateTimerFactoryClosure", "dart:async", "_TimerFactory", "_factory");
     copyValue(html, isDOMEnabled ? "_scheduleImmediateClosure" : "_pureIsolateScheduleImmediateClosure", "dart:async", "_ScheduleImmediate", "_closure");
 
     if (isDOMEnabled) {
         // Create strongly reachable document wrapper. Document wrapper acts as a
         // retainer for in-document node wrappers group. There is no need to destroy
         // this persistent handle explicitly because we will shutdown the isolate on
@@ skipping 752 matching lines @@
         Dart_Handle libraryIdHandle = Dart_ListGetAt(libraryIdList, i);
         Dart_Handle exception = 0;
         intptr_t libraryId = DartUtilities::toInteger(libraryIdHandle, exception);
         ASSERT(!exception);
         DartScriptState* scriptState = lookupScriptStateFromLibraryIdMap(isolate, v8Context, libraryIdMap, libraryId);
         result.append(scriptState);
     }
 }
 
 }