Treat content:// URL scheme as local in content shell on Android

This fixes an issue that content:// URLs behaves differently from
file:// URLs in tests.

Bug: 1136315
Change-Id: Idf5311ea36c07a739ef6025023675e5a8000cdec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462898Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816448}

content/shell/common/shell_content_client.cc

@@ -67,4 +67,10 @@ blink::OriginTrialPolicy* ShellContentClient::GetOriginTrialPolicy() {
   return &origin_trial_policy_;
 }
 
+void ShellContentClient::AddAdditionalSchemes(Schemes* schemes) {
+#if defined(OS_ANDROID)
+  schemes->local_schemes.push_back(url::kContentScheme);
+#endif
+}
+
 }  // namespace content

content/shell/common/shell_content_client.h

@@ -25,6 +25,7 @@ class ShellContentClient : public ContentClient {
   base::RefCountedMemory* GetDataResourceBytes(int resource_id) override;
   gfx::Image& GetNativeImageNamed(int resource_id) override;
   blink::OriginTrialPolicy* GetOriginTrialPolicy() override;
+  void AddAdditionalSchemes(Schemes* schemes) override;
 
  private:
   ShellOriginTrialPolicy origin_trial_policy_;