omni: add theme thumbnails for chooser

Change-Id: I8e4c4500db6e8e0d709d55c45b8254ce77cb3f76
diff --git a/google/themes/Bl4ckAndYell0/assets/thumbnail.png b/google/themes/Bl4ckAndYell0/assets/thumbnail.png
new file mode 100644
index 0000000..a1f9519
--- /dev/null
+++ b/google/themes/Bl4ckAndYell0/assets/thumbnail.png
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diff --git a/google/themes/DarknessMeister/assets/thumbnail.png b/google/themes/DarknessMeister/assets/thumbnail.png
new file mode 100644
index 0000000..2170a69
--- /dev/null
+++ b/google/themes/DarknessMeister/assets/thumbnail.png
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diff --git a/google/themes/FromHell/assets/thumbnail.png b/google/themes/FromHell/assets/thumbnail.png
new file mode 100644
index 0000000..ca02621
--- /dev/null
+++ b/google/themes/FromHell/assets/thumbnail.png
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diff --git a/google/themes/OmniTheme/assets/thumbnail.png b/google/themes/OmniTheme/assets/thumbnail.png
new file mode 100644
index 0000000..03e66f2
--- /dev/null
+++ b/google/themes/OmniTheme/assets/thumbnail.png
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diff --git a/google/themes/SluttyPink/assets/thumbnail.png b/google/themes/SluttyPink/assets/thumbnail.png
new file mode 100644
index 0000000..9841324
--- /dev/null
+++ b/google/themes/SluttyPink/assets/thumbnail.png
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diff --git a/google/themes/SmokedGreen/assets/thumbnail.png b/google/themes/SmokedGreen/assets/thumbnail.png
new file mode 100644
index 0000000..497b6c5
--- /dev/null
+++ b/google/themes/SmokedGreen/assets/thumbnail.png
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