Add -ifsameorigin to autoplay experiment.

third_party/WebKit/Source/core/html/AutoplayExperimentTest.cpp

Index: third_party/WebKit/Source/core/html/AutoplayExperimentTest.cpp
diff --git a/third_party/WebKit/Source/core/html/AutoplayExperimentTest.cpp b/third_party/WebKit/Source/core/html/AutoplayExperimentTest.cpp
index e581a9405d10e149a543c3655aeca4698566831e..59118c27d729f83d18e18f60d682ab4b86af7f75 100644
--- a/third_party/WebKit/Source/core/html/AutoplayExperimentTest.cpp
+++ b/third_party/WebKit/Source/core/html/AutoplayExperimentTest.cpp
@@ -52,6 +52,8 @@ public:
             .WillByDefault(Return(false));
         ON_CALL(*this, pageVisibilityState())
             .WillByDefault(Return(PageVisibilityStateVisible));
+        ON_CALL(*this, frame())
+            .WillByDefault(Return(nullptr));
         ON_CALL(*this, absoluteBoundingBoxRect())
             .WillByDefault(Return(
                 IntRect(10, 10, 100, 100)));
@@ -85,6 +87,7 @@ public:
     MOCK_METHOD0(isLegacyViewportType, bool());
     MOCK_CONST_METHOD0(pageVisibilityState, PageVisibilityState());
     MOCK_CONST_METHOD0(autoplayExperimentMode, String());
+    MOCK_CONST_METHOD0(frame, LocalFrame*());

[mlamouri (slow - plz ping), 2016/04/26 14:41:40]

I wish we had more tests for this. Are there layout tests for the experiments?

[liberato (no reviews please), 2016/04/26 18:30:24]

yes, there are layout tests for this also:

https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit...

     MOCK_METHOD1(setRequestPositionUpdates, void(bool));
     MOCK_CONST_METHOD0(absoluteBoundingBoxRect, IntRect());