Cleanup ResourceLoadPriority setting

Source/core/loader/FrameFetchContextTest.cpp

Index: Source/core/loader/FrameFetchContextTest.cpp
diff --git a/Source/core/loader/FrameFetchContextTest.cpp b/Source/core/loader/FrameFetchContextTest.cpp
index 75ae5c2da912923f1797d4be95218dc7c2d1b976..c6ce4a080ef08c5919cc5ce2b32ba1d250ba4b97 100644
--- a/Source/core/loader/FrameFetchContextTest.cpp
+++ b/Source/core/loader/FrameFetchContextTest.cpp
@@ -35,6 +35,7 @@
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameOwner.h"
 #include "core/frame/FrameView.h"
+#include "core/frame/Settings.h"
 #include "core/html/HTMLDocument.h"
 #include "core/loader/DocumentLoader.h"
 #include "core/loader/EmptyClients.h"
@@ -46,32 +47,102 @@
 
 namespace blink {
 
-class FrameFetchContextUpgradeTest : public ::testing::Test {
+class StubFrameLoaderClientWithParent final : public EmptyFrameLoaderClient {
 public:
-    FrameFetchContextUpgradeTest()
-        : secureURL(ParsedURLString, "https://secureorigin.test/image.png")
-        , exampleOrigin(SecurityOrigin::create(KURL(ParsedURLString, "https://example.test/")))
-        , secureOrigin(SecurityOrigin::create(secureURL))
+    static PassOwnPtrWillBeRawPtr<StubFrameLoaderClientWithParent> create(Frame* parent)
+    {
+        return adoptPtrWillBeNoop(new StubFrameLoaderClientWithParent(parent));
+    }
+
+    DEFINE_INLINE_VIRTUAL_TRACE()
     {
+        visitor->trace(m_parent);
+        EmptyFrameLoaderClient::trace(visitor);
     }
 
+    Frame* parent() const override { return m_parent.get(); }
+
+private:
+    explicit StubFrameLoaderClientWithParent(Frame* parent)
+        : m_parent(parent)
+    {
+    }
+
+    RawPtrWillBeMember<Frame> m_parent;
+};
+
+class StubFrameOwner : public NoBaseWillBeGarbageCollectedFinalized<StubFrameOwner>, public FrameOwner {
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(StubFrameOwner);
+public:
+    DEFINE_INLINE_VIRTUAL_TRACE() { FrameOwner::trace(visitor); }
+
+    bool isLocal() const override { return false; }
+    SandboxFlags sandboxFlags() const override { return SandboxNone; }
+    void dispatchLoad() override { }
+    void renderFallbackContent() override { }
+};
+
+class FrameFetchContextTest : public ::testing::Test {
 protected:
-    virtual void SetUp()
+    void SetUp() override
     {
         dummyPageHolder = DummyPageHolder::create(IntSize(500, 500));
         dummyPageHolder->page().setDeviceScaleFactor(1.0);
         documentLoader = DocumentLoader::create(&dummyPageHolder->frame(), ResourceRequest("http://www.example.com"), SubstituteData());
         document = toHTMLDocument(&dummyPageHolder->document());
-        fetchContext = &documentLoader->fetcher()->context();
+        fetchContext = static_cast<FrameFetchContext*>(&documentLoader->fetcher()->context());
         FrameFetchContext::provideDocumentToContext(*fetchContext, document.get());
     }
 
-    virtual void TearDown()
+    void TearDown() override
     {
         documentLoader->detachFromFrame();
         documentLoader.clear();
+
+        if (childFrame) {
+            childDocumentLoader->detachFromFrame();
+            childDocumentLoader.clear();
+            childFrame->detach(FrameDetachType::Remove);
+        }
     }
 
+    FrameFetchContext* createChildFrame()
+    {
+        childClient = StubFrameLoaderClientWithParent::create(document->frame());
+        childFrame = LocalFrame::create(childClient.get(), document->frame()->host(), &owner);
+        childFrame->setView(FrameView::create(childFrame.get(), IntSize(500, 500)));
+        childFrame->init();
+        childDocumentLoader = DocumentLoader::create(childFrame.get(), ResourceRequest("http://www.example.com"), SubstituteData());
+        childDocument = childFrame->document();
+        FrameFetchContext* childFetchContext = static_cast<FrameFetchContext*>(&childDocumentLoader->fetcher()->context());
+        FrameFetchContext::provideDocumentToContext(*childFetchContext, childDocument.get());
+        return childFetchContext;
+    }
+
+    OwnPtr<DummyPageHolder> dummyPageHolder;
+    // We don't use the DocumentLoader directly in any tests, but need to keep it around as long
+    // as the ResourceFetcher and Document live due to indirect usage.
+    RefPtrWillBePersistent<DocumentLoader> documentLoader;
+    RefPtrWillBePersistent<Document> document;
+    Persistent<FrameFetchContext> fetchContext;
+
+    OwnPtrWillBeRawPtr<StubFrameLoaderClientWithParent> childClient;
+    RefPtrWillBeRawPtr<LocalFrame> childFrame;
+    RefPtrWillBePersistent<DocumentLoader> childDocumentLoader;
+    RefPtrWillBePersistent<Document> childDocument;
+    StubFrameOwner owner;
+
+};
+
+class FrameFetchContextUpgradeTest : public FrameFetchContextTest {
+public:
+    FrameFetchContextUpgradeTest()
+        : exampleOrigin(SecurityOrigin::create(KURL(ParsedURLString, "https://example.test/")))
+        , secureOrigin(SecurityOrigin::create(KURL(ParsedURLString, "https://secureorigin.test/image.png")))
+    {
+    }
+
+protected:
     void expectUpgrade(const char* input, const char* expected)
     {
         expectUpgrade(input, WebURLRequest::RequestContextScript, WebURLRequest::FrameTypeNone, expected);
@@ -110,16 +181,8 @@ protected:
             fetchRequest.resourceRequest().httpHeaderField("Upgrade-Insecure-Requests").utf8().data());
     }
 
-    KURL secureURL;
     RefPtr<SecurityOrigin> exampleOrigin;
     RefPtr<SecurityOrigin> secureOrigin;
-
-    OwnPtr<DummyPageHolder> dummyPageHolder;
-    // We don't use the DocumentLoader directly in any tests, but need to keep it around as long
-    // as the ResourceFetcher and Document live due to indirect usage.
-    RefPtrWillBePersistent<DocumentLoader> documentLoader;
-    RefPtrWillBePersistent<Document> document;
-    Persistent<FetchContext> fetchContext;
 };
 
 TEST_F(FrameFetchContextUpgradeTest, UpgradeInsecureResourceRequests)
@@ -224,27 +287,11 @@ TEST_F(FrameFetchContextUpgradeTest, SendHTTPSHeader)
     }
 }
 
-class FrameFetchContextHintsTest : public ::testing::Test {
+class FrameFetchContextHintsTest : public FrameFetchContextTest {
 public:
     FrameFetchContextHintsTest() { }
 
 protected:
-    virtual void SetUp()
-    {
-        dummyPageHolder = DummyPageHolder::create(IntSize(500, 500));
-        dummyPageHolder->page().setDeviceScaleFactor(1.0);
-        documentLoader = DocumentLoader::create(&dummyPageHolder->frame(), ResourceRequest("http://www.example.com"), SubstituteData());
-        document = toHTMLDocument(&dummyPageHolder->document());
-        fetchContext = static_cast<FrameFetchContext*>(&documentLoader->fetcher()->context());
-        FrameFetchContext::provideDocumentToContext(*fetchContext, document.get());
-    }
-
-    virtual void TearDown()
-    {
-        documentLoader->detachFromFrame();
-        documentLoader.clear();
-    }
-
     void expectHeader(const char* input, const char* headerName, bool isPresent, const char* headerValue, float width = 0)
     {
         KURL inputURL(ParsedURLString, input);
@@ -260,13 +307,6 @@ protected:
         EXPECT_STREQ(isPresent ? headerValue : "",
             fetchRequest.resourceRequest().httpHeaderField(headerName).utf8().data());
     }
-
-    OwnPtr<DummyPageHolder> dummyPageHolder;
-    // We don't use the DocumentLoader directly in any tests, but need to keep it around as long
-    // as the ResourceFetcher and Document live due to indirect usage.
-    RefPtrWillBePersistent<DocumentLoader> documentLoader;
-    RefPtrWillBePersistent<Document> document;
-    Persistent<FrameFetchContext> fetchContext;
 };
 
 TEST_F(FrameFetchContextHintsTest, MonitorDPRHints)
@@ -323,71 +363,7 @@ TEST_F(FrameFetchContextHintsTest, MonitorAllHints)
     expectHeader("http://www.example.com/1.gif", "Viewport-Width", true, "500");
 }
 
-class StubFrameLoaderClientWithParent final : public EmptyFrameLoaderClient {
-public:
-    static PassOwnPtrWillBeRawPtr<StubFrameLoaderClientWithParent> create(Frame* parent)
-    {
-        return adoptPtrWillBeNoop(new StubFrameLoaderClientWithParent(parent));
-    }
-
-    DEFINE_INLINE_VIRTUAL_TRACE()
-    {
-        visitor->trace(m_parent);
-        EmptyFrameLoaderClient::trace(visitor);
-    }
-
-    Frame* parent() const override { return m_parent.get(); }
-
-private:
-    explicit StubFrameLoaderClientWithParent(Frame* parent)
-        : m_parent(parent)
-    {
-    }
-
-    RawPtrWillBeMember<Frame> m_parent;
-};
-
-class StubFrameOwner : public NoBaseWillBeGarbageCollectedFinalized<StubFrameOwner>, public FrameOwner {
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(StubFrameOwner);
-public:
-    DEFINE_INLINE_VIRTUAL_TRACE() { FrameOwner::trace(visitor); }
-
-    bool isLocal() const override { return false; }
-    SandboxFlags sandboxFlags() const override { return SandboxNone; }
-    void dispatchLoad() override { }
-    void renderFallbackContent() override { }
-};
-
-class FrameFetchContextCachePolicyTest : public ::testing::Test {
-public:
-    FrameFetchContextCachePolicyTest() { }
-
-protected:
-    void SetUp() override
-    {
-        dummyPageHolder = DummyPageHolder::create(IntSize(500, 500));
-        dummyPageHolder->page().setDeviceScaleFactor(1.0);
-        documentLoader = DocumentLoader::create(&dummyPageHolder->frame(), ResourceRequest("http://www.example.com"), SubstituteData());
-        document = toHTMLDocument(&dummyPageHolder->document());
-        fetchContext = static_cast<FrameFetchContext*>(&documentLoader->fetcher()->context());
-        FrameFetchContext::provideDocumentToContext(*fetchContext, document.get());
-    }
-
-    void TearDown() override
-    {
-        documentLoader->detachFromFrame();
-        documentLoader.clear();
-    }
-
-    OwnPtr<DummyPageHolder> dummyPageHolder;
-    // We don't use the DocumentLoader directly in any tests, but need to keep it around as long
-    // as the ResourceFetcher and Document live due to indirect usage.
-    RefPtrWillBePersistent<DocumentLoader> documentLoader;
-    RefPtrWillBePersistent<Document> document;
-    Persistent<FrameFetchContext> fetchContext;
-};
-
-TEST_F(FrameFetchContextCachePolicyTest, MainResource)
+TEST_F(FrameFetchContextTest, MainResource)
 {
     // Default case
     ResourceRequest request("http://www.example.com");
@@ -419,16 +395,7 @@ TEST_F(FrameFetchContextCachePolicyTest, MainResource)
     EXPECT_EQ(ReloadIgnoringCacheData, fetchContext->resourceRequestCachePolicy(conditional, Resource::MainResource));
 
     // Set up a child frame
-    OwnPtrWillBeRawPtr<StubFrameLoaderClientWithParent> client = StubFrameLoaderClientWithParent::create(document->frame());
-    StubFrameOwner owner;
-    RefPtrWillBeRawPtr<LocalFrame> childFrame = LocalFrame::create(client.get(), document->frame()->host(), &owner);
-    childFrame->setView(FrameView::create(childFrame.get(), IntSize(500, 500)));
-    childFrame->init();
-    RefPtrWillBePersistent<DocumentLoader> childDocumentLoader =
-        DocumentLoader::create(childFrame.get(), ResourceRequest("http://www.example.com"), SubstituteData());
-    RefPtrWillBePersistent<Document> childDocument = childFrame->document();
-    FrameFetchContext* childFetchContext = static_cast<FrameFetchContext*>(&childDocumentLoader->fetcher()->context());
-    FrameFetchContext::provideDocumentToContext(*childFetchContext, childDocument.get());
+    FrameFetchContext* childFetchContext = createChildFrame();
 
     // Child frame as part of back/forward
     document->frame()->loader().setLoadType(FrameLoadTypeBackForward);
@@ -441,10 +408,84 @@ TEST_F(FrameFetchContextCachePolicyTest, MainResource)
     // Child frame as part of end to end reload
     document->frame()->loader().setLoadType(FrameLoadTypeReloadFromOrigin);
     EXPECT_EQ(ReloadBypassingCache, childFetchContext->resourceRequestCachePolicy(request, Resource::MainResource));
+}
 
-    childDocumentLoader->detachFromFrame();
-    childDocumentLoader.clear();
-    childFrame->detach(FrameDetachType::Remove);
+TEST_F(FrameFetchContextTest, ModifyPriorityForExperiments)
+{
+    Settings* settings = document->frame()->settings();
+    FetchRequest request(ResourceRequest("http://www.example.com"), FetchInitiatorInfo());
+
+    FetchRequest preloadRequest(ResourceRequest("http://www.example.com"), FetchInitiatorInfo());
+    preloadRequest.setForPreload(true);
+
+    FetchRequest deferredRequest(ResourceRequest("http://www.example.com"), FetchInitiatorInfo());
+    deferredRequest.setDefer(FetchRequest::LazyLoad);
+
+    // Start with all experiments disabled.
+    settings->setFEtchIncreaseAsyncScriptPriority(false);
+    settings->setFEtchIncreaseFontPriority(false);
+    settings->setFEtchDeferLateScripts(false);
+    settings->setFEtchIncreasePriorities(false);
+    settings->setLowPriorityIframes(false);
+
+    // Base case, no priority change. Note that this triggers m_imageFetched, which will matter for setFetchDeferLateScripts() case below.
+    EXPECT_EQ(ResourceLoadPriorityLow, fetchContext->modifyPriorityForExperiments(ResourceLoadPriorityLow, Resource::Image, request));
+
+    // Font priority with and without fetchIncreaseFontPriority()
+    EXPECT_EQ(ResourceLoadPriorityMedium, fetchContext->modifyPriorityForExperiments(ResourceLoadPriorityMedium, Resource::Font, request));
+    settings->setFEtchIncreaseFontPriority(true);
+    EXPECT_EQ(ResourceLoadPriorityHigh, fetchContext->modifyPriorityForExperiments(ResourceLoadPriorityMedium, Resource::Font, request));
+
+    // Basic script cases
+    EXPECT_EQ(ResourceLoadPriorityMedium, fetchContext->modifyPriorityForExperiments(ResourceLoadPriorityMedium, Resource::Script, request));
+    EXPECT_EQ(ResourceLoadPriorityMedium, fetchContext->modifyPriorityForExperiments(ResourceLoadPriorityMedium, Resource::Script, preloadRequest));
+
+    // Enable deferring late scripts. Preload priority should drop.
+    settings->setFEtchDeferLateScripts(true);
+    EXPECT_EQ(ResourceLoadPriorityLow, fetchContext->modifyPriorityForExperiments(ResourceLoadPriorityMedium, Resource::Script, preloadRequest));
+
+    // Enable increasing priority of async scripts.
+    EXPECT_EQ(ResourceLoadPriorityLow, fetchContext->modifyPriorityForExperiments(ResourceLoadPriorityMedium, Resource::Script, deferredRequest));
+    settings->setFEtchIncreaseAsyncScriptPriority(true);
+    EXPECT_EQ(ResourceLoadPriorityMedium, fetchContext->modifyPriorityForExperiments(ResourceLoadPriorityMedium, Resource::Script, deferredRequest));
+
+    // Enable increased priorities for the remainder.
+    settings->setFEtchIncreasePriorities(true);
+
+    // Re-test font priority with increased prioriries
+    settings->setFEtchIncreaseFontPriority(false);
+    EXPECT_EQ(ResourceLoadPriorityHigh, fetchContext->modifyPriorityForExperiments(ResourceLoadPriorityMedium, Resource::Font, request));
+    settings->setFEtchIncreaseFontPriority(true);
+    EXPECT_EQ(ResourceLoadPriorityVeryHigh, fetchContext->modifyPriorityForExperiments(ResourceLoadPriorityMedium, Resource::Font, request));
+
+    // Re-test basic script cases and deferring late script case with increased prioriries
+    settings->setFEtchIncreasePriorities(true);
+    settings->setFEtchDeferLateScripts(false);
+    EXPECT_EQ(ResourceLoadPriorityVeryHigh, fetchContext->modifyPriorityForExperiments(ResourceLoadPriorityMedium, Resource::Script, request));
+    EXPECT_EQ(ResourceLoadPriorityHigh, fetchContext->modifyPriorityForExperiments(ResourceLoadPriorityMedium, Resource::Script, preloadRequest));
+
+    // Re-test deferring late scripts.
+    settings->setFEtchDeferLateScripts(true);
+    EXPECT_EQ(ResourceLoadPriorityMedium, fetchContext->modifyPriorityForExperiments(ResourceLoadPriorityMedium, Resource::Script, preloadRequest));
+
+    // Re-test increasing priority of async scripts. Should ignore general incraesed priorities.
+    settings->setFEtchIncreaseAsyncScriptPriority(false);
+    EXPECT_EQ(ResourceLoadPriorityLow, fetchContext->modifyPriorityForExperiments(ResourceLoadPriorityMedium, Resource::Script, deferredRequest));
+    settings->setFEtchIncreaseAsyncScriptPriority(true);
+    EXPECT_EQ(ResourceLoadPriorityMedium, fetchContext->modifyPriorityForExperiments(ResourceLoadPriorityMedium, Resource::Script, deferredRequest));
+
+    // Set up a child frame, test main resource load with and without setLowPriorityIframes()
+    FrameFetchContext* childFetchContext = createChildFrame();
+    EXPECT_EQ(ResourceLoadPriorityVeryHigh, childFetchContext->modifyPriorityForExperiments(ResourceLoadPriorityVeryHigh, Resource::MainResource, request));
+    settings->setLowPriorityIframes(true);
+    EXPECT_EQ(ResourceLoadPriorityVeryLow, childFetchContext->modifyPriorityForExperiments(ResourceLoadPriorityVeryHigh, Resource::MainResource, request));
+
+    // Ensure we don't go out of bounds
+    settings->setFEtchIncreasePriorities(true);
+    EXPECT_EQ(ResourceLoadPriorityVeryHigh, fetchContext->modifyPriorityForExperiments(ResourceLoadPriorityVeryHigh, Resource::Script, request));
+    settings->setFEtchIncreasePriorities(false);
+    settings->setFEtchDeferLateScripts(true);
+    EXPECT_EQ(ResourceLoadPriorityVeryLow, fetchContext->modifyPriorityForExperiments(ResourceLoadPriorityVeryLow, Resource::Script, preloadRequest));
 }
 
 } // namespace