Add test cases for mouse hover on annotation.

The author and the content of the annotation must be shown when mouse
hover on the annotation.

R=dsinclair@chromium.org, thestig@chromium.org

Review URL: https://codereview.chromium.org/2269953003 .
diff --git a/pdfium/annots/annotation_highlight_author_content.evt b/pdfium/annots/annotation_highlight_author_content.evt
new file mode 100644
index 0000000..55dadb9
--- /dev/null
+++ b/pdfium/annots/annotation_highlight_author_content.evt
@@ -0,0 +1 @@
+mousemove,128,713
diff --git a/pdfium/annots/annotation_highlight_author_content.pdf b/pdfium/annots/annotation_highlight_author_content.pdf
new file mode 100644
index 0000000..25f3f22
--- /dev/null
+++ b/pdfium/annots/annotation_highlight_author_content.pdf
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diff --git a/pdfium/annots/annotation_highlight_author_content_expected.pdf.0.png b/pdfium/annots/annotation_highlight_author_content_expected.pdf.0.png
new file mode 100644
index 0000000..51dcbc6
--- /dev/null
+++ b/pdfium/annots/annotation_highlight_author_content_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_highlight_long_content.evt b/pdfium/annots/annotation_highlight_long_content.evt
new file mode 100644
index 0000000..55dadb9
--- /dev/null
+++ b/pdfium/annots/annotation_highlight_long_content.evt
@@ -0,0 +1 @@
+mousemove,128,713
diff --git a/pdfium/annots/annotation_highlight_long_content.pdf b/pdfium/annots/annotation_highlight_long_content.pdf
new file mode 100644
index 0000000..7fd9103
--- /dev/null
+++ b/pdfium/annots/annotation_highlight_long_content.pdf
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diff --git a/pdfium/annots/annotation_highlight_long_content_expected.pdf.0.png b/pdfium/annots/annotation_highlight_long_content_expected.pdf.0.png
new file mode 100644
index 0000000..8f90bd6
--- /dev/null
+++ b/pdfium/annots/annotation_highlight_long_content_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_highlight_no_author.evt b/pdfium/annots/annotation_highlight_no_author.evt
new file mode 100644
index 0000000..55dadb9
--- /dev/null
+++ b/pdfium/annots/annotation_highlight_no_author.evt
@@ -0,0 +1 @@
+mousemove,128,713
diff --git a/pdfium/annots/annotation_highlight_no_author.pdf b/pdfium/annots/annotation_highlight_no_author.pdf
new file mode 100644
index 0000000..d00f480
--- /dev/null
+++ b/pdfium/annots/annotation_highlight_no_author.pdf
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diff --git a/pdfium/annots/annotation_highlight_no_author_expected.pdf.0.png b/pdfium/annots/annotation_highlight_no_author_expected.pdf.0.png
new file mode 100644
index 0000000..967a5e2
--- /dev/null
+++ b/pdfium/annots/annotation_highlight_no_author_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_highlight_no_author_no_content.evt b/pdfium/annots/annotation_highlight_no_author_no_content.evt
new file mode 100644
index 0000000..55dadb9
--- /dev/null
+++ b/pdfium/annots/annotation_highlight_no_author_no_content.evt
@@ -0,0 +1 @@
+mousemove,128,713
diff --git a/pdfium/annots/annotation_highlight_no_author_no_content.pdf b/pdfium/annots/annotation_highlight_no_author_no_content.pdf
new file mode 100644
index 0000000..4dc216a
--- /dev/null
+++ b/pdfium/annots/annotation_highlight_no_author_no_content.pdf
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diff --git a/pdfium/annots/annotation_highlight_no_author_no_content_expected.pdf.0.png b/pdfium/annots/annotation_highlight_no_author_no_content_expected.pdf.0.png
new file mode 100644
index 0000000..d38f9f4
--- /dev/null
+++ b/pdfium/annots/annotation_highlight_no_author_no_content_expected.pdf.0.png
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diff --git a/pdfium/annots/annotation_highlight_no_content.evt b/pdfium/annots/annotation_highlight_no_content.evt
new file mode 100644
index 0000000..55dadb9
--- /dev/null
+++ b/pdfium/annots/annotation_highlight_no_content.evt
@@ -0,0 +1 @@
+mousemove,128,713
diff --git a/pdfium/annots/annotation_highlight_no_content.pdf b/pdfium/annots/annotation_highlight_no_content.pdf
new file mode 100644
index 0000000..c130aee
--- /dev/null
+++ b/pdfium/annots/annotation_highlight_no_content.pdf
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diff --git a/pdfium/annots/annotation_highlight_no_content_expected.pdf.0.png b/pdfium/annots/annotation_highlight_no_content_expected.pdf.0.png
new file mode 100644
index 0000000..d38f9f4
--- /dev/null
+++ b/pdfium/annots/annotation_highlight_no_content_expected.pdf.0.png
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