Moving pixel-capturing code from web_test_proxy_base.* into pixel_dump.*

components/test_runner/web_test_runner.h

Index: components/test_runner/web_test_runner.h
diff --git a/components/test_runner/web_test_runner.h b/components/test_runner/web_test_runner.h
index 9080c9d119c53976f98e559b0f2bcf4dd4218001..93148a0f5d7feafb2ead9898ffe602f391421e14 100644
--- a/components/test_runner/web_test_runner.h
+++ b/components/test_runner/web_test_runner.h
@@ -8,6 +8,10 @@
 #include <string>
 #include <vector>
 
+#include "base/callback_forward.h"
+
+class SkBitmap;
+
 namespace base {
 class DictionaryValue;
 }
@@ -15,6 +19,7 @@ class DictionaryValue;
 namespace blink {
 class WebContentSettingsClient;
 class WebLocalFrame;
+class WebView;
 }
 
 namespace test_runner {
@@ -42,6 +47,13 @@ class WebTestRunner {
   // (i.e. text mode if testRunner.dumpAsText() was called from javascript).
   virtual std::string DumpLayout(blink::WebLocalFrame* frame) = 0;
 
+  // Snapshots image of |web_view| using the mode requested by the current test
+  // and calls |callback| with the result.  Caller needs to ensure that
+  // |web_view| stays alive until |callback| is called.
+  virtual void DumpPixelsAsync(
+      blink::WebView* web_view,
+      const base::Callback<void(const SkBitmap&)>& callback) = 0;
+
   // Replicates changes to layout test runtime flags
   // (i.e. changes that happened in another renderer).
   // See also WebTestDelegate::OnLayoutTestRuntimeFlagsChanged.