Add support for scaling textures in AndroidVideoCapturer.

talk/app/webrtc/java/jni/native_handle_impl.cc

Index: talk/app/webrtc/java/jni/native_handle_impl.cc
diff --git a/talk/app/webrtc/java/jni/native_handle_impl.cc b/talk/app/webrtc/java/jni/native_handle_impl.cc
index ed9ad8e8918ad1d6e5adb21c42fbb30c82960802..bb31ba648c76fb4b21cdcbb0f8f16d6775398acb 100644
--- a/talk/app/webrtc/java/jni/native_handle_impl.cc
+++ b/talk/app/webrtc/java/jni/native_handle_impl.cc
@@ -28,9 +28,17 @@
 #include "talk/app/webrtc/java/jni/native_handle_impl.h"
 
 #include "webrtc/base/checks.h"
+#include "webrtc/base/bind.h"
+
+using rtc::scoped_refptr;
+using webrtc::NativeHandleBuffer;
 
 namespace webrtc_jni {
 
+namespace {
+void ScaledFrameNotInUse(scoped_refptr<NativeHandleBuffer> original) {}
+}  // anonymous namespace
+
 NativeHandleImpl::NativeHandleImpl(JNIEnv* jni,
                                    jint j_oes_texture_id,
                                    jfloatArray j_transform_matrix)
@@ -64,4 +72,22 @@ AndroidTextureBuffer::NativeToI420Buffer() {
   return nullptr;
 }
 
+rtc::scoped_refptr<AndroidTextureBuffer> AndroidTextureBuffer::CropAndScale(
+    int cropped_input_width,
+    int cropped_input_height,
+    int dst_widht,
+    int dst_height) {
+  // TODO(perkj) Implement cropping.
+  RTC_CHECK_EQ(cropped_input_width, width_);
+  RTC_CHECK_EQ(cropped_input_height, height_);
+
+  // Here we use Bind magic to add a reference count to |this| until the newly
+  // created AndroidTextureBuffer is destructed. ScaledFrameNotInUse will be
+  // called that happens and when it finishes, the reference count to |this|
+  // will be decreased by one.
+  return new rtc::RefCountedObject<AndroidTextureBuffer>(
+      dst_widht, dst_height, native_handle_,
+      rtc::Bind(&ScaledFrameNotInUse, this));
+}
+
 }  // namespace webrtc_jni