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JsReplace(script, args...) works by replacing $1, $2, $3, etc in |script| with
JS literal values constructed from |args|, similar to
base::ReplaceStringPlaceholders, except that args can be a variadic mix of
strings, ints, base::Values, GURLs and more.

Unlike StringPrintf or manual concatenation, this utility will properly
escape string content, even if it contains slashes or quotation marks.

Example 1:

  GURL page_url("http://example.com");
  EXPECT_TRUE(ExecuteScript(
      shell(), JsReplace("window.open($1, '_blank');", page_url)));

$1 is replaced with a double-quoted JS string literal: "http://example.com".
Note that quotes around $1 are not required.

Example 2:

  bool forced_reload = true;
  EXPECT_TRUE(ExecuteScript(
      shell(), JsReplace("window.location.reload($1);", forced_reload)));

This becomes "window.location.reload(true);" -- because bool values are
supported by base::Value. Numbers, lists, and dicts also work.

Change-Id: I11041b6d2db299949266290b940e2d855522f2ea
Reviewed-on: https://chromium-review.googlesource.com/1125098
Commit-Queue: Nick Carter <nick@chromium.org>
Reviewed-by: Albert J. Wong <ajwong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577262}