[Android] Upstream WebView.allow{Content|File}Access implementation.

android_webview/lib/aw_content_browser_client.cc

Index: android_webview/lib/aw_content_browser_client.cc
diff --git a/android_webview/lib/aw_content_browser_client.cc b/android_webview/lib/aw_content_browser_client.cc
index 2a07343e799bf0e3d319f988884755e51a0d4538..d44a475755b544eca4744e03a13a889aeea6117d 100644
--- a/android_webview/lib/aw_content_browser_client.cc
+++ b/android_webview/lib/aw_content_browser_client.cc
@@ -6,6 +6,9 @@
 
 #include "android_webview/browser/aw_cookie_access_policy.h"
 #include "android_webview/browser/renderer_host/aw_resource_dispatcher_host_delegate.h"
+#include "android_webview/common/url_constants.h"
+#include "content/public/browser/child_process_security_policy.h"
+#include "content/public/browser/render_process_host.h"
 
 namespace android_webview {
 
@@ -16,6 +19,14 @@ AwContentBrowserClient::AwContentBrowserClient()
 AwContentBrowserClient::~AwContentBrowserClient() {
 }
 
+void AwContentBrowserClient::RenderProcessHostCreated(
+    content::RenderProcessHost* host) {
+  // Grant content: scheme to the whole process, since we impose per-view
+  // access checks.
+  content::ChildProcessSecurityPolicy::GetInstance()->GrantScheme(
+      host->GetID(), android_webview::kContentScheme);
+}
+
 void AwContentBrowserClient::ResourceDispatcherHostCreated() {
   ChromeContentBrowserClient::ResourceDispatcherHostCreated();
   AwResourceDispatcherHostDelegate::ResourceDispatcherHostCreated();