Implement File constructor.

LayoutTests/fast/files/blob-parts-slice-test-expected.txt

Index: LayoutTests/fast/files/blob-parts-slice-test-expected.txt
diff --git a/LayoutTests/fast/files/blob-parts-slice-test-expected.txt b/LayoutTests/fast/files/blob-parts-slice-test-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..87727d8c5c5b02626ef3d431c2c30889451a0086
--- /dev/null
+++ b/LayoutTests/fast/files/blob-parts-slice-test-expected.txt
@@ -0,0 +1,117 @@
+Test the Blob.slice() behavior for Blobs made of multiple parts.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+Blob .slice(2, 3)
+PASS blobContents is "2"
+File .slice(2, 3)
+PASS fileContents is "2"
+Blob .slice(2, 12)
+PASS blobContents is "23456789"
+File .slice(2, 12)
+PASS fileContents is "23456789"
+Blob .slice(2, 2)
+PASS blobContents is ""
+File .slice(2, 2)
+PASS fileContents is ""
+Blob .slice(2, 1)
+PASS blobContents is ""
+File .slice(2, 1)
+PASS fileContents is ""
+Blob .slice(2, -12)
+PASS blobContents is ""
+File .slice(2, -12)
+PASS fileContents is ""
+Blob .slice(2, 2147483647)
+PASS blobContents is "23456789"
+File .slice(2, 2147483647)
+PASS fileContents is "23456789"
+Blob .slice(2, -2147483648)
+PASS blobContents is ""
+File .slice(2, -2147483648)
+PASS fileContents is ""
+Blob .slice(2, 9223372036854775000)
+PASS blobContents is "23456789"
+File .slice(2, 9223372036854775000)
+PASS fileContents is "23456789"
+Blob .slice(2, -9223372036854775000)
+PASS blobContents is ""
+File .slice(2, -9223372036854775000)
+PASS fileContents is ""
+Blob .slice(-2, -1)
+PASS blobContents is "8"
+File .slice(-2, -1)
+PASS fileContents is "8"
+Blob .slice(-2, -2)
+PASS blobContents is ""
+File .slice(-2, -2)
+PASS fileContents is ""
+Blob .slice(-2, -3)
+PASS blobContents is ""
+File .slice(-2, -3)
+PASS fileContents is ""
+Blob .slice(-2, -12)
+PASS blobContents is ""
+File .slice(-2, -12)
+PASS fileContents is ""
+Blob .slice(-2, 2147483647)
+PASS blobContents is "89"
+File .slice(-2, 2147483647)
+PASS fileContents is "89"
+Blob .slice(-2, -2147483648)
+PASS blobContents is ""
+File .slice(-2, -2147483648)
+PASS fileContents is ""
+Blob .slice(-2, 9223372036854775000)
+PASS blobContents is "89"
+File .slice(-2, 9223372036854775000)
+PASS fileContents is "89"
+Blob .slice(-2, -9223372036854775000)
+PASS blobContents is ""
+File .slice(-2, -9223372036854775000)
+PASS fileContents is ""
+Blob .slice(0)
+PASS blobContents is "0123456789"
+File .slice(0)
+PASS fileContents is "0123456789"
+Blob .slice(2)
+PASS blobContents is "23456789"
+File .slice(2)
+PASS fileContents is "23456789"
+Blob .slice(-2)
+PASS blobContents is "89"
+File .slice(-2)
+PASS fileContents is "89"
+Blob .slice(12)
+PASS blobContents is ""
+File .slice(12)
+PASS fileContents is ""
+Blob .slice(-12)
+PASS blobContents is "0123456789"
+File .slice(-12)
+PASS fileContents is "0123456789"
+Blob .slice(2147483647)
+PASS blobContents is ""
+File .slice(2147483647)
+PASS fileContents is ""
+Blob .slice(-2147483648)
+PASS blobContents is "0123456789"
+File .slice(-2147483648)
+PASS fileContents is "0123456789"
+Blob .slice(9223372036854775000)
+PASS blobContents is ""
+File .slice(9223372036854775000)
+PASS fileContents is ""
+Blob .slice(-9223372036854775000)
+PASS blobContents is "0123456789"
+File .slice(-9223372036854775000)
+PASS fileContents is "0123456789"
+Blob .slice()
+PASS blobContents is "0123456789"
+File .slice()
+PASS fileContents is "0123456789"
+PASS successfullyParsed is true
+
+TEST COMPLETE
+