Deduplicate fuzz cases on the frontend before they are displayed.

fuzzer/go/frontend/data/report_mock.go

Index: fuzzer/go/frontend/data/report_mock.go
diff --git a/fuzzer/go/frontend/data/report_mock.go b/fuzzer/go/frontend/data/report_mock.go
new file mode 100644
index 0000000000000000000000000000000000000000..de98b4062a48f96660ef287d8221e344e4dc3ac8
--- /dev/null
+++ b/fuzzer/go/frontend/data/report_mock.go
@@ -0,0 +1,97 @@
+package data
+
+import "fmt"
+
+func MockReport(category, id string) FuzzReport {
+	if category == "skpicture" {
+		return mockPictureDetails[id]
+	}
+	if category == "api" {
+		return mockAPIDetails[id]
+	}
+	panic(fmt.Sprintf("No mock reports for category %s", category))
+}
+
+var mockFlags = []string{"foo", "bar"}
+
+var mockPictureDetails = map[string]FuzzReport{
+	"aaaa": FuzzReport{
+		DebugStackTrace:   makeStacktrace("alpha", "beta", 16),
+		ReleaseStackTrace: makeStacktrace("alpha", "beta", 16),
+		DebugFlags:        mockFlags,
+		FuzzName:          "aaaa",
+		FuzzCategory:      "skpicture",
+	},
+	"bbbb": FuzzReport{
+		DebugStackTrace:   makeStacktrace("alpha", "beta", 16),
+		ReleaseStackTrace: StackTrace{},
+		DebugFlags:        mockFlags,
+		FuzzName:          "bbbb",
+		FuzzCategory:      "skpicture",
+	},
+	"cccc": FuzzReport{
+		DebugStackTrace:   makeStacktrace("alpha", "beta", 16),
+		ReleaseStackTrace: makeStacktrace("alpha", "gamma", 26),
+		DebugFlags:        mockFlags,
+		FuzzName:          "cccc",
+		FuzzCategory:      "skpicture",
+	},
+	"dddd": FuzzReport{
+		DebugStackTrace:   makeStacktrace("alpha", "gamma", 43),
+		ReleaseStackTrace: makeStacktrace("delta", "epsilon", 125),
+		DebugFlags:        mockFlags,
+		FuzzName:          "dddd",
+		FuzzCategory:      "skpicture",
+	},
+	"eeee": FuzzReport{
+		DebugStackTrace:   StackTrace{},
+		ReleaseStackTrace: StackTrace{},
+		DebugFlags:        mockFlags,
+		FuzzName:          "eeee",
+		FuzzCategory:      "skpicture",
+	},
+	"ffff": FuzzReport{
+		DebugStackTrace:   makeStacktrace("alpha", "beta", 16),
+		ReleaseStackTrace: makeStacktrace("alpha", "beta", 16),
+		DebugFlags:        mockFlags,
+		FuzzName:          "ffff",
+		FuzzCategory:      "skpicture",
+	},
+	"gggg": FuzzReport{
+		DebugStackTrace:   makeStacktrace("delta", "epsilon", 122),
+		ReleaseStackTrace: StackTrace{},
+		DebugFlags:        mockFlags,
+		FuzzName:          "gggg",
+		FuzzCategory:      "skpicture",
+	},
+}
+
+var mockAPIDetails = map[string]FuzzReport{
+	"hhhh": FuzzReport{
+		DebugStackTrace:   makeStacktrace("alpha", "beta", 16),
+		ReleaseStackTrace: makeStacktrace("alpha", "beta", 16),
+		DebugFlags:        mockFlags,
+		FuzzName:          "hhhh",
+		FuzzCategory:      "api",
+	},
+	"iiii": FuzzReport{
+		DebugStackTrace:   makeStacktrace("alpha", "beta", 16),
+		ReleaseStackTrace: StackTrace{},
+		DebugFlags:        mockFlags,
+		FuzzName:          "iiii",
+		FuzzCategory:      "api",
+	},
+}
+
+func makeStacktrace(file, function string, line int) StackTrace {
+	return StackTrace{
+		Frames: []StackTraceFrame{
+			{
+				PackageName:  "mock/package/",
+				FileName:     file,
+				LineNumber:   line,
+				FunctionName: function,
+			},
+		},
+	}
+}