WebCrypto: Add SHA-1 support to crypto.subtle.digest().

public/platform/Platform.h

Index: public/platform/Platform.h
diff --git a/public/platform/Platform.h b/public/platform/Platform.h
index d00f86f7475e860ef4369767f636140306d707db..a466e6206cca320c0a8ca7afbbabafce53ba7b50 100644
--- a/public/platform/Platform.h
+++ b/public/platform/Platform.h
@@ -55,6 +55,7 @@ class WebContentDecryptionModule;
 class WebClipboard;
 class WebCompositorSupport;
 class WebCookieJar;
+class WebCrypto;
 class WebDeviceMotionListener;
 class WebDiscardableMemory;
 class WebFallbackThemeEngine;
@@ -294,6 +295,7 @@ public:
     // A wrapper for tcmalloc's GetHeapProfile()
     virtual WebString getHeapProfile() { return WebString(); }
 
+
     // Message Ports -------------------------------------------------------
 
     // Creates a Message Port Channel. This can be called on any thread.
@@ -533,6 +535,7 @@ public:
     // with |velocity| and already scrolled |cumulativeScroll| pixels.
     virtual WebGestureCurve* createFlingAnimationCurve(int deviceSource, const WebFloatPoint& velocity, const WebSize& cumulativeScroll) { return 0; }
 
+
     // WebRTC ----------------------------------------------------------
 
     // Creates an WebRTCPeerConnectionHandler for RTCPeerConnection.
@@ -549,6 +552,12 @@ public:
     virtual void didStopWorkerRunLoop(const WebWorkerRunLoop&) { }
 
 
+    // WebCrypto ----------------------------------------------------------
+
+    // May return 0.
+    virtual WebCrypto* crypto() { return 0; }
+
+
     // Device Motion / Orientation ----------------------------------------
 
     // Sets a Listener to listen for device motion data updates.