PaymentApp: Implement GetAllManifests() in PaymentAppContext.

content/browser/payments/payment_app_context_impl.cc

Index: content/browser/payments/payment_app_context_impl.cc
diff --git a/content/browser/payments/payment_app_context_impl.cc b/content/browser/payments/payment_app_context_impl.cc
index e2a84e62b0b3c82fbefe36b17c76c714184fdf2e..55657619838eb2da4a0ece1f618c21bd74f87e0e 100644
--- a/content/browser/payments/payment_app_context_impl.cc
+++ b/content/browser/payments/payment_app_context_impl.cc
@@ -61,7 +61,10 @@ PaymentAppDatabase* PaymentAppContextImpl::payment_app_database() const {
 
 void PaymentAppContextImpl::GetAllManifests(
     const GetAllManifestsCallback& callback) {
-  NOTIMPLEMENTED();
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::Bind(&PaymentAppContextImpl::GetAllManifestsOnIO, this, callback));
 }
 
 PaymentAppContextImpl::~PaymentAppContextImpl() {
@@ -90,4 +93,21 @@ void PaymentAppContextImpl::ShutdownOnIO() {
   payment_app_database_.reset();
 }
 
+void PaymentAppContextImpl::GetAllManifestsOnIO(
+    const GetAllManifestsCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  payment_app_database()->ReadAllManifests(base::Bind(
+      &PaymentAppContextImpl::DidGetAllManifestsOnIO, this, callback));
+}
+
+void PaymentAppContextImpl::DidGetAllManifestsOnIO(
+    const GetAllManifestsCallback& callback,
+    Manifests manifests) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(callback, base::Passed(std::move(manifests))));
+}
+
 }  // namespace content