Add missing RTC_EXPORT for the component build.

Bug: webrtc:9419
Change-Id: I3225259fb4cc55e9820f590928795f4587f1e3cb
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/153884
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29479}
diff --git a/modules/audio_processing/include/audio_processing.h b/modules/audio_processing/include/audio_processing.h
index 6fc1057..e46deea 100644
--- a/modules/audio_processing/include/audio_processing.h
+++ b/modules/audio_processing/include/audio_processing.h
@@ -226,7 +226,7 @@
 // // Close the application...
 // delete apm;
 //
-class AudioProcessing : public rtc::RefCountInterface {
+class RTC_EXPORT AudioProcessing : public rtc::RefCountInterface {
  public:
   // The struct below constitutes the new parameter scheme for the audio
   // processing. It is being introduced gradually and until it is fully
diff --git a/modules/desktop_capture/desktop_frame.h b/modules/desktop_capture/desktop_frame.h
index a5b67ec..3a18b78 100644
--- a/modules/desktop_capture/desktop_frame.h
+++ b/modules/desktop_capture/desktop_frame.h
@@ -174,7 +174,7 @@
 };
 
 // A DesktopFrame that stores data in shared memory.
-class SharedMemoryDesktopFrame : public DesktopFrame {
+class RTC_EXPORT SharedMemoryDesktopFrame : public DesktopFrame {
  public:
   // May return nullptr if |shared_memory_factory| failed to create a
   // SharedMemory instance.
diff --git a/modules/desktop_capture/shared_memory.h b/modules/desktop_capture/shared_memory.h
index ba846da..2e2d2f3 100644
--- a/modules/desktop_capture/shared_memory.h
+++ b/modules/desktop_capture/shared_memory.h
@@ -20,6 +20,7 @@
 #include <memory>
 
 #include "rtc_base/constructor_magic.h"
+#include "rtc_base/system/rtc_export.h"
 
 namespace webrtc {
 
@@ -29,7 +30,7 @@
 // for video frames must extend this class with creation and destruction logic
 // specific for the target platform and then call
 // DesktopCapturer::SetSharedMemoryFactory().
-class SharedMemory {
+class RTC_EXPORT SharedMemory {
  public:
 #if defined(WEBRTC_WIN)
   typedef HANDLE Handle;