Ladybird/Android: Create a service for ImageDecoder

This follows the pattern for the other services spawned by WebContent.
The notable quirk about this service is that it's actually spawned by
the ImageCodecPlugin rather than in main.cpp in the non-Android port.

As a result we needed to do some ifdef surgery to get all the pieces
in place. But we can now load images in the Android port again :^).

Ladybird/ImageCodecPlugin.cpp

@@ -6,7 +6,11 @@
  */
 
 #include "ImageCodecPlugin.h"
-#include "HelperProcess.h"
+#ifdef AK_OS_ANDROID
+#    include <Ladybird/Android/src/main/cpp/WebContentService.h>
+#else
+#    include "HelperProcess.h"
+#endif
 #include "Utilities.h"
 #include <LibGfx/Bitmap.h>
 #include <LibGfx/ImageFormats/ImageDecoder.h>
@@ -19,8 +23,12 @@ ImageCodecPlugin::~ImageCodecPlugin() = default;
 Optional<Web::Platform::DecodedImage> ImageCodecPlugin::decode_image(ReadonlyBytes bytes)
 {
     if (!m_client) {
+#ifdef AK_OS_ANDROID
+        m_client = MUST(bind_service<ImageDecoderClient::Client>(&bind_image_decoder_java));
+#else
         auto candidate_image_decoder_paths = get_paths_for_helper_process("ImageDecoder"sv).release_value_but_fixme_should_propagate_errors();
         m_client = launch_image_decoder_process(candidate_image_decoder_paths).release_value_but_fixme_should_propagate_errors();
+#endif
         m_client->on_death = [&] {
             m_client = nullptr;
         };