[WebPayments] Implementing Profile filter and dedupe

components/payments/README

Index: components/payments/README
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+This directory contains shared code used by multiple platforms' native
+implementations of PaymentRequest. In general, business logic (i.e., logic which
+manipulates data and is not specific to any particular platform's display of the
+data) should live here as much as possible.
+
+
+Internally, the directory uses the Layered Components model:
+
+http://www.chromium.org/developers/design-documents/layered-components-design
+
+
+In practical terms, our division between content/ and core/ is usually just a
+question of whether the contents have a dependency on Mojo:
+
+* ./core/ -- preferred whenever possible
+
+* ./content/ -- code with a Mojo dependency
+
+* ./content/android/ -- Android bindings for code in either core/ or content/
+
+
+Intended consumers of this code are organized as follows:
+
+* chrome/android/.../chrome/browser/payments/ -- Android UI Implementation
+
+* chrome/browser/ui/views/payments/ -- Desktop UI implementation
+
+* content/browser/android/payments -- Android bindings for PaymentApps
+
+* content/browser/payments/ -- PaymentApps implementation
+
+* ios/chrome/browser/payments/ -- iOS UI implementation
+
+* ios/web/payments/ and ios/web/public/payments/ -- iOS communication layer,
+                                                    replacing Mojo