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diff --git a/third_party/pycoverage/coverage/htmlfiles/coverage_html.js b/third_party/pycoverage/coverage/htmlfiles/coverage_html.js
new file mode 100644
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+++ b/third_party/pycoverage/coverage/htmlfiles/coverage_html.js
@@ -0,0 +1,376 @@
+// Coverage.py HTML report browser code.
+/*jslint browser: true, sloppy: true, vars: true, plusplus: true, maxerr: 50, indent: 4 */
+/*global coverage: true, document, window, $ */
+
+coverage = {};
+
+// Find all the elements with shortkey_* class, and use them to assign a shotrtcut key.
+coverage.assign_shortkeys = function () {
+    $("*[class*='shortkey_']").each(function (i, e) {
+        $.each($(e).attr("class").split(" "), function (i, c) {
+            if (/^shortkey_/.test(c)) {
+                $(document).bind('keydown', c.substr(9), function () {
+                    $(e).click();
+                });
+            }
+        });
+    });
+};
+
+// Create the events for the help panel.
+coverage.wire_up_help_panel = function () {
+    $("#keyboard_icon").click(function () {
+        // Show the help panel, and position it so the keyboard icon in the
+        // panel is in the same place as the keyboard icon in the header.
+        $(".help_panel").show();
+        var koff = $("#keyboard_icon").offset();
+        var poff = $("#panel_icon").position();
+        $(".help_panel").offset({
+            top: koff.top-poff.top,
+            left: koff.left-poff.left
+        });
+    });
+    $("#panel_icon").click(function () {
+        $(".help_panel").hide();
+    });
+};
+
+// Loaded on index.html
+coverage.index_ready = function ($) {
+    // Look for a cookie containing previous sort settings:
+    var sort_list = [];
+    var cookie_name = "COVERAGE_INDEX_SORT";
+    var i;
+
+    // This almost makes it worth installing the jQuery cookie plugin:
+    if (document.cookie.indexOf(cookie_name) > -1) {
+        var cookies = document.cookie.split(";");
+        for (i = 0; i < cookies.length; i++) {
+            var parts = cookies[i].split("=");
+
+            if ($.trim(parts[0]) === cookie_name && parts[1]) {
+                sort_list = eval("[[" + parts[1] + "]]");
+                break;
+            }
+        }
+    }
+
+    // Create a new widget which exists only to save and restore
+    // the sort order:
+    $.tablesorter.addWidget({
+        id: "persistentSort",
+
+        // Format is called by the widget before displaying:
+        format: function (table) {
+            if (table.config.sortList.length === 0 && sort_list.length > 0) {
+                // This table hasn't been sorted before - we'll use
+                // our stored settings:
+                $(table).trigger('sorton', [sort_list]);
+            }
+            else {
+                // This is not the first load - something has
+                // already defined sorting so we'll just update
+                // our stored value to match:
+                sort_list = table.config.sortList;
+            }
+        }
+    });
+
+    // Configure our tablesorter to handle the variable number of
+    // columns produced depending on report options:
+    var headers = [];
+    var col_count = $("table.index > thead > tr > th").length;
+
+    headers[0] = { sorter: 'text' };
+    for (i = 1; i < col_count-1; i++) {
+        headers[i] = { sorter: 'digit' };
+    }
+    headers[col_count-1] = { sorter: 'percent' };
+
+    // Enable the table sorter:
+    $("table.index").tablesorter({
+        widgets: ['persistentSort'],
+        headers: headers
+    });
+
+    coverage.assign_shortkeys();
+    coverage.wire_up_help_panel();
+
+    // Watch for page unload events so we can save the final sort settings:
+    $(window).unload(function () {
+        document.cookie = cookie_name + "=" + sort_list.toString() + "; path=/";
+    });
+};
+
+// -- pyfile stuff --
+
+coverage.pyfile_ready = function ($) {
+    // If we're directed to a particular line number, highlight the line.
+    var frag = location.hash;
+    if (frag.length > 2 && frag[1] === 'n') {
+        $(frag).addClass('highlight');
+        coverage.set_sel(parseInt(frag.substr(2), 10));
+    }
+    else {
+        coverage.set_sel(0);
+    }
+
+    $(document)
+        .bind('keydown', 'j', coverage.to_next_chunk_nicely)
+        .bind('keydown', 'k', coverage.to_prev_chunk_nicely)
+        .bind('keydown', '0', coverage.to_top)
+        .bind('keydown', '1', coverage.to_first_chunk)
+        ;
+
+    $(".button_toggle_run").click(function (evt) {coverage.toggle_lines(evt.target, "run");});
+    $(".button_toggle_exc").click(function (evt) {coverage.toggle_lines(evt.target, "exc");});
+    $(".button_toggle_mis").click(function (evt) {coverage.toggle_lines(evt.target, "mis");});
+    $(".button_toggle_par").click(function (evt) {coverage.toggle_lines(evt.target, "par");});
+
+    coverage.assign_shortkeys();
+    coverage.wire_up_help_panel();
+};
+
+coverage.toggle_lines = function (btn, cls) {
+    btn = $(btn);
+    var hide = "hide_"+cls;
+    if (btn.hasClass(hide)) {
+        $("#source ."+cls).removeClass(hide);
+        btn.removeClass(hide);
+    }
+    else {
+        $("#source ."+cls).addClass(hide);
+        btn.addClass(hide);
+    }
+};
+
+// Return the nth line div.
+coverage.line_elt = function (n) {
+    return $("#t" + n);
+};
+
+// Return the nth line number div.
+coverage.num_elt = function (n) {
+    return $("#n" + n);
+};
+
+// Return the container of all the code.
+coverage.code_container = function () {
+    return $(".linenos");
+};
+
+// Set the selection.  b and e are line numbers.
+coverage.set_sel = function (b, e) {
+    // The first line selected.
+    coverage.sel_begin = b;
+    // The next line not selected.
+    coverage.sel_end = (e === undefined) ? b+1 : e;
+};
+
+coverage.to_top = function () {
+    coverage.set_sel(0, 1);
+    coverage.scroll_window(0);
+};
+
+coverage.to_first_chunk = function () {
+    coverage.set_sel(0, 1);
+    coverage.to_next_chunk();
+};
+
+coverage.is_transparent = function (color) {
+    // Different browsers return different colors for "none".
+    return color === "transparent" || color === "rgba(0, 0, 0, 0)";
+};
+
+coverage.to_next_chunk = function () {
+    var c = coverage;
+
+    // Find the start of the next colored chunk.
+    var probe = c.sel_end;
+    while (true) {
+        var probe_line = c.line_elt(probe);
+        if (probe_line.length === 0) {
+            return;
+        }
+        var color = probe_line.css("background-color");
+        if (!c.is_transparent(color)) {
+            break;
+        }
+        probe++;
+    }
+
+    // There's a next chunk, `probe` points to it.
+    var begin = probe;
+
+    // Find the end of this chunk.
+    var next_color = color;
+    while (next_color === color) {
+        probe++;
+        probe_line = c.line_elt(probe);
+        next_color = probe_line.css("background-color");
+    }
+    c.set_sel(begin, probe);
+    c.show_selection();
+};
+
+coverage.to_prev_chunk = function () {
+    var c = coverage;
+
+    // Find the end of the prev colored chunk.
+    var probe = c.sel_begin-1;
+    var probe_line = c.line_elt(probe);
+    if (probe_line.length === 0) {
+        return;
+    }
+    var color = probe_line.css("background-color");
+    while (probe > 0 && c.is_transparent(color)) {
+        probe--;
+        probe_line = c.line_elt(probe);
+        if (probe_line.length === 0) {
+            return;
+        }
+        color = probe_line.css("background-color");
+    }
+
+    // There's a prev chunk, `probe` points to its last line.
+    var end = probe+1;
+
+    // Find the beginning of this chunk.
+    var prev_color = color;
+    while (prev_color === color) {
+        probe--;
+        probe_line = c.line_elt(probe);
+        prev_color = probe_line.css("background-color");
+    }
+    c.set_sel(probe+1, end);
+    c.show_selection();
+};
+
+// Return the line number of the line nearest pixel position pos
+coverage.line_at_pos = function (pos) {
+    var l1 = coverage.line_elt(1),
+        l2 = coverage.line_elt(2),
+        result;
+    if (l1.length && l2.length) {
+        var l1_top = l1.offset().top,
+            line_height = l2.offset().top - l1_top,
+            nlines = (pos - l1_top) / line_height;
+        if (nlines < 1) {
+            result = 1;
+        }
+        else {
+            result = Math.ceil(nlines);
+        }
+    }
+    else {
+        result = 1;
+    }
+    return result;
+};
+
+// Returns 0, 1, or 2: how many of the two ends of the selection are on
+// the screen right now?
+coverage.selection_ends_on_screen = function () {
+    if (coverage.sel_begin === 0) {
+        return 0;
+    }
+
+    var top = coverage.line_elt(coverage.sel_begin);
+    var next = coverage.line_elt(coverage.sel_end-1);
+
+    return (
+        (top.isOnScreen() ? 1 : 0) +
+        (next.isOnScreen() ? 1 : 0)
+    );
+};
+
+coverage.to_next_chunk_nicely = function () {
+    coverage.finish_scrolling();
+    if (coverage.selection_ends_on_screen() === 0) {
+        // The selection is entirely off the screen: select the top line on
+        // the screen.
+        var win = $(window);
+        coverage.select_line_or_chunk(coverage.line_at_pos(win.scrollTop()));
+    }
+    coverage.to_next_chunk();
+};
+
+coverage.to_prev_chunk_nicely = function () {
+    coverage.finish_scrolling();
+    if (coverage.selection_ends_on_screen() === 0) {
+        var win = $(window);
+        coverage.select_line_or_chunk(coverage.line_at_pos(win.scrollTop() + win.height()));
+    }
+    coverage.to_prev_chunk();
+};
+
+// Select line number lineno, or if it is in a colored chunk, select the
+// entire chunk
+coverage.select_line_or_chunk = function (lineno) {
+    var c = coverage;
+    var probe_line = c.line_elt(lineno);
+    if (probe_line.length === 0) {
+        return;
+    }
+    var the_color = probe_line.css("background-color");
+    if (!c.is_transparent(the_color)) {
+        // The line is in a highlighted chunk.
+        // Search backward for the first line.
+        var probe = lineno;
+        var color = the_color;
+        while (probe > 0 && color === the_color) {
+            probe--;
+            probe_line = c.line_elt(probe);
+            if (probe_line.length === 0) {
+                break;
+            }
+            color = probe_line.css("background-color");
+        }
+        var begin = probe + 1;
+
+        // Search forward for the last line.
+        probe = lineno;
+        color = the_color;
+        while (color === the_color) {
+            probe++;
+            probe_line = c.line_elt(probe);
+            color = probe_line.css("background-color");
+        }
+
+        coverage.set_sel(begin, probe);
+    }
+    else {
+        coverage.set_sel(lineno);
+    }
+};
+
+coverage.show_selection = function () {
+    var c = coverage;
+
+    // Highlight the lines in the chunk
+    c.code_container().find(".highlight").removeClass("highlight");
+    for (var probe = c.sel_begin; probe > 0 && probe < c.sel_end; probe++) {
+        c.num_elt(probe).addClass("highlight");
+    }
+
+    c.scroll_to_selection();
+};
+
+coverage.scroll_to_selection = function () {
+    // Scroll the page if the chunk isn't fully visible.
+    if (coverage.selection_ends_on_screen() < 2) {
+        // Need to move the page. The html,body trick makes it scroll in all
+        // browsers, got it from http://stackoverflow.com/questions/3042651
+        var top = coverage.line_elt(coverage.sel_begin);
+        var top_pos = parseInt(top.offset().top, 10);
+        coverage.scroll_window(top_pos - 30);
+    }
+};
+
+coverage.scroll_window = function (to_pos) {
+    $("html,body").animate({scrollTop: to_pos}, 200);
+};
+
+coverage.finish_scrolling = function () {
+    $("html,body").stop(true, true);
+};